50 occurrences across the corpus

The Mishnah

Mishnah Oholot 13:6

The following do not reduce [the area of the window]: Bone does not reduce [the area] for [other] bones; Nor [corpse] flesh for [other] flesh; Nor an olive-sized [portion] of a corpse; Nor an olive-sized portion of carrion; Nor a lentil-sized portion of reptile; Nor an egg-sized portion of food; Nor produce growing in the windows; Nor a cobweb having no substance; Nor the carcass of a clean bird which had been intended [for food]; Nor the carcass of an unclean bird which had been intended [for food] and had been rendered susceptible to uncleanness; Nor warp and woof threads that have negaim; Nor a brick from a bet haperas, the words of Rabbi Meir. But the sages say: the brick can reduce, because the dust [of the bet haperas] is clean. This is the general rule: what is clean reduces [the area], and what is unclean does not reduce it.

Mishnah Negaim 1:1

The signs of negaim are two which, in fact, are four. The bright spot (baheret) is bright white like snow; secondary to it is the sign as white as the lime of the Temple. The rising (se'et) is as white of the skin of an egg; secondary to it is the like white wool, the words of Rabbi Meir. But the sages say: the rising (se'et) is white wool and secondary to it is like the white of the skin of an egg.

Mishnah Negaim 1:3

These four colors combine with each other to declare free [from uncleanness], to certify or to shut up. "To shut up" one who is at the end of the first week; "To declare free [from uncleanness]", one who is at the end of the second week. "To certify", one in which a discoloration or white hair arose, by the end of the first week, by the end of the second week or after it had been declared free [from uncleanness]. "To certify", when a spreading arose in it by the end of the first week, by the end of the second week or after it had been declared free [from uncleanness]. "To certify", when all one's skin turned white after it had been declared free from uncleanness; "To declare free from uncleanness’, when all one's skin turned white after the sign had been certified unclean or after it had been shut up. These are the colors of signs of negaim upon which depend all decisions concerning negaim.

Mishnah Negaim 1:3

These four colors combine with each other to declare free [from uncleanness], to certify or to shut up. "To shut up" one who is at the end of the first week; "To declare free [from uncleanness]", one who is at the end of the second week. "To certify", one in which a discoloration or white hair arose, by the end of the first week, by the end of the second week or after it had been declared free [from uncleanness]. "To certify", when a spreading arose in it by the end of the first week, by the end of the second week or after it had been declared free [from uncleanness]. "To certify", when all one's skin turned white after it had been declared free from uncleanness; "To declare free from uncleanness’, when all one's skin turned white after the sign had been certified unclean or after it had been shut up. These are the colors of signs of negaim upon which depend all decisions concerning negaim.

Mishnah Negaim 1:4

Rabbi Hanina, the vice-chief of priests, says: the colors of negaim are sixteen. Rabbi Dosa ben Harkinas says: the colors of negaim are thirty-six. Akaviah ben Mahalalel says: seventy-two. Rabbi Hanina the vice-chief of priests says: negaim may not be inspected for the first time at the end of Shabbat, since the end of that week will fall on Shabbat; Nor on a Monday, since the end of the second week will fall on Shabbat; Nor on a Tuesday, in the case of houses, since the end of the third week will fall on Shabbat. Rabbi Akiva says: they may be inspected at all times, and if the time for the second inspection falls on Shabbat it is postponed to after Shabbat; and this procedure leads sometimes to a leniency and sometimes to a stringency.

Mishnah Negaim 1:4

Rabbi Hanina, the vice-chief of priests, says: the colors of negaim are sixteen. Rabbi Dosa ben Harkinas says: the colors of negaim are thirty-six. Akaviah ben Mahalalel says: seventy-two. Rabbi Hanina the vice-chief of priests says: negaim may not be inspected for the first time at the end of Shabbat, since the end of that week will fall on Shabbat; Nor on a Monday, since the end of the second week will fall on Shabbat; Nor on a Tuesday, in the case of houses, since the end of the third week will fall on Shabbat. Rabbi Akiva says: they may be inspected at all times, and if the time for the second inspection falls on Shabbat it is postponed to after Shabbat; and this procedure leads sometimes to a leniency and sometimes to a stringency.

Mishnah Negaim 1:4

Rabbi Hanina, the vice-chief of priests, says: the colors of negaim are sixteen. Rabbi Dosa ben Harkinas says: the colors of negaim are thirty-six. Akaviah ben Mahalalel says: seventy-two. Rabbi Hanina the vice-chief of priests says: negaim may not be inspected for the first time at the end of Shabbat, since the end of that week will fall on Shabbat; Nor on a Monday, since the end of the second week will fall on Shabbat; Nor on a Tuesday, in the case of houses, since the end of the third week will fall on Shabbat. Rabbi Akiva says: they may be inspected at all times, and if the time for the second inspection falls on Shabbat it is postponed to after Shabbat; and this procedure leads sometimes to a leniency and sometimes to a stringency.

Mishnah Negaim 2:1

The bright spot in a German appears as dull white, and the dull white spot in an Ethiopian appears as bright white. Rabbi Ishmael says: the children of Israel (may I be atonement for them!) are like boxwood, neither black nor white but of an intermediate shade. Rabbi Akiva says: painters have materials with which they portray figures in black, in white, and in an intermediate shade; let, therefore a paint of an intermediate shade be brought and applied around the outside of the nega, and it will then appear as on skin of intermediate shade. Rabbi Judah says: in determining the colors of negaim the law is to be lenient and not stringent; let,therefore, the negaim of the German be inspected on the color of his own body so that the law is lenient, and let that of the Ethiopian be inspected as if it were on the intermediate shade so that the law is also lenient. The sages say: both are to be treated as if the nega was on the intermediate shade.

Mishnah Negaim 2:1

The bright spot in a German appears as dull white, and the dull white spot in an Ethiopian appears as bright white. Rabbi Ishmael says: the children of Israel (may I be atonement for them!) are like boxwood, neither black nor white but of an intermediate shade. Rabbi Akiva says: painters have materials with which they portray figures in black, in white, and in an intermediate shade; let, therefore a paint of an intermediate shade be brought and applied around the outside of the nega, and it will then appear as on skin of intermediate shade. Rabbi Judah says: in determining the colors of negaim the law is to be lenient and not stringent; let,therefore, the negaim of the German be inspected on the color of his own body so that the law is lenient, and let that of the Ethiopian be inspected as if it were on the intermediate shade so that the law is also lenient. The sages say: both are to be treated as if the nega was on the intermediate shade.

Mishnah Negaim 2:2

Negaim may not be inspected in the early morning or in the evening, nor in a house, nor on a cloudy day, because then the dull white appears like bright white; nor may they be inspected at noon, because then the bright white appears like dull white. When are they to be inspected? During the third, fourth, fifth, seventh, eighth or ninth hour, the words of Rabbi Meir. Rabbi Judah ruled: during the fourth, fifth, eighth or ninth hour.

Mishnah Negaim 2:3

A priest who is blind in one eye or the light of whose eyes is dim should not inspect negaim; for it says, "Wherever the priest's eyes can see" (Leviticus 13:12). In a dark house one may not open up windows in order to inspect his nega.

Mishnah Negaim 2:4

What is [the posture] of examining negaim? A man is inspected in the posture of one that hoes or one that gathers olives. And a woman [is inspected in the posture] of one who is arranging dough and one who nurses her child, and one that weaves at an upright loom if the nega was in the right armpit. Rabbi Judah says: also in the posture of one that spins flax if it was within the left armpit. Just as [is the posture] for examining for the nega, so too [is the posture] for shaving hair.

Mishnah Negaim 2:5

All negaim may be examined by a person, except his own. Rabbi Meir ruled: not even the negaim of his relatives. All vows may be released by a person, except his own. Rabbi Judah says: not even those vows of his wife that affect relationships between her and others. All firstlings may be examined by a person, except his own firstlings.

Mishnah Negaim 2:5

All negaim may be examined by a person, except his own. Rabbi Meir ruled: not even the negaim of his relatives. All vows may be released by a person, except his own. Rabbi Judah says: not even those vows of his wife that affect relationships between her and others. All firstlings may be examined by a person, except his own firstlings.

Mishnah Negaim 3:1

Everyone can become impure from negaim, except for a non-Jew and a resident alien. All are qualified to inspect negaim, but only a priest may declare them unclean or clean. He is told, "Say: 'unclean,'" and he repeats "unclean," or "Say: 'clean,'" and he repeats "clean." Two negaim may not be inspected simultaneously whether in one man or in two men; rather he inspects one first and isolates him, certifies him as unclean or pronounces him clean, and then he inspects the second. One who is isolated may not be isolated again nor may one who is certified unclean be certified unclean again. One who is certified unclean may not be isolated nor may one who is isolated be certified unclean. But in the beginning, or at the end of a week, he may isolate on account of the one nega and isolate him on account of another one; he may certify him unclean on account of one sign and also certify him unclean on account of another sign; he may isolated the one sign and declare the other clean, or certify the one unclean and declare the other clean.

Mishnah Negaim 3:1

Everyone can become impure from negaim, except for a non-Jew and a resident alien. All are qualified to inspect negaim, but only a priest may declare them unclean or clean. He is told, "Say: 'unclean,'" and he repeats "unclean," or "Say: 'clean,'" and he repeats "clean." Two negaim may not be inspected simultaneously whether in one man or in two men; rather he inspects one first and isolates him, certifies him as unclean or pronounces him clean, and then he inspects the second. One who is isolated may not be isolated again nor may one who is certified unclean be certified unclean again. One who is certified unclean may not be isolated nor may one who is isolated be certified unclean. But in the beginning, or at the end of a week, he may isolate on account of the one nega and isolate him on account of another one; he may certify him unclean on account of one sign and also certify him unclean on account of another sign; he may isolated the one sign and declare the other clean, or certify the one unclean and declare the other clean.

Mishnah Negaim 3:1

Everyone can become impure from negaim, except for a non-Jew and a resident alien. All are qualified to inspect negaim, but only a priest may declare them unclean or clean. He is told, "Say: 'unclean,'" and he repeats "unclean," or "Say: 'clean,'" and he repeats "clean." Two negaim may not be inspected simultaneously whether in one man or in two men; rather he inspects one first and isolates him, certifies him as unclean or pronounces him clean, and then he inspects the second. One who is isolated may not be isolated again nor may one who is certified unclean be certified unclean again. One who is certified unclean may not be isolated nor may one who is isolated be certified unclean. But in the beginning, or at the end of a week, he may isolate on account of the one nega and isolate him on account of another one; he may certify him unclean on account of one sign and also certify him unclean on account of another sign; he may isolated the one sign and declare the other clean, or certify the one unclean and declare the other clean.

Mishnah Negaim 3:5

Head or beard (scall) negaim become unclean for two weeks and by one of the following two signs: by yellow thin hair or by a spreading. "By yellow thin hair" in the beginning, at the end of the first week, at the end of the second week, or after they have been pronounced clean. "Or by a spreading," at the end of the first week, at the end of the second week or after they have been pronounced clean. They become unclean for two weeks which are only thirteen days.

Mishnah Negaim 3:6

Scalp baldness or forehead baldness [negaim] become unclean for two weeks and by one of the following two signs: by quick flesh or by a spreading. "By quick flesh," in the beginning, at the end of the first week, at the end of the second week, or after they have been pronounced clean. "Or by a spreading," at the end of the first week, at the end of the second week, or after they have been pronounced clean. They become unclean for two weeks which are only thirteen days.

Mishnah Negaim 4:1

There are [laws] that apply to the white hair that do not apply to the spreading, while others apply to the spreading and do not apply to the white hair. That white hair causes uncleanness at the beginning, it causes uncleanness whatever the state of its whiteness, and it is never a sign of cleanness. There are laws that apply to the spreading, for the spreading causes uncleanness however small its extent, it causes uncleanness for all negaim and even when it is outside the nega, and these laws do not apply to the white hair.

Mishnah Negaim 4:2

There are [laws] that apply to the quick flesh that do not apply to the spreading, while other restrictions apply to the spreading and do not apply to the quick flesh. That quick flesh causes uncleanness at the beginning, it causes uncleanness whatever its color, and it is never a sign of cleanness. There are [laws] that apply to the spreading, for the spreading causes uncleanness however small its extent, it causes uncleanness in all forms of negaim and also where it is outside the leprosy sign, and these laws do not apply to the quick flesh.

Mishnah Negaim 5:4

Any doubt in negaim in the beginning is regarded as clean before uncleanness has been established, but after uncleanness has been established a doubt is regarded as unclean. How is this so? If two men came to a priest one having a bright spot the size of a split bean and the other having one of the size of a sela, and at the end of the week each had one the size of a sela, and it is not known on which of them the spreading had occurred, Whether this occurred with one man or with two men, each is clean. Rabbi Akiva said: if one man is involved he is unclean, but if two men are involved each is clean.

Mishnah Negaim 6:8

The following places in a person do not become unclean on account of a bright spot: the inside of the eye, the inside of the ear, the inside of the nose and the inside of the mouth, wrinkles, wrinkles in the neck, under the breast and the armpit, the sole of the foot, the nails, the head and the beard; and a boil, a burn and a blister that are festering. All these: Do not become unclean on account of negaim Do not combine with other negaim, A nega is not considered to spread into them, Do not become unclean on account of quick flesh, And they do not act to prevent a person from being considered to have turned completely white. If subsequently a bald spot arose in the head or beard, or if a boil, a burn or a blister formed a scar: They may become unclean by negaim, But they do not combine with other negaim, A nega is not considered to spread into them, And they do not become unclean on account of quick flesh. But they do act to prevent a person from being considered to have all turned white. The head and the beard before they have grown hair, and warts with thin necks on the head or the beard, are treated as the skin of the flesh.

Mishnah Negaim 6:8

The following places in a person do not become unclean on account of a bright spot: the inside of the eye, the inside of the ear, the inside of the nose and the inside of the mouth, wrinkles, wrinkles in the neck, under the breast and the armpit, the sole of the foot, the nails, the head and the beard; and a boil, a burn and a blister that are festering. All these: Do not become unclean on account of negaim Do not combine with other negaim, A nega is not considered to spread into them, Do not become unclean on account of quick flesh, And they do not act to prevent a person from being considered to have turned completely white. If subsequently a bald spot arose in the head or beard, or if a boil, a burn or a blister formed a scar: They may become unclean by negaim, But they do not combine with other negaim, A nega is not considered to spread into them, And they do not become unclean on account of quick flesh. But they do act to prevent a person from being considered to have all turned white. The head and the beard before they have grown hair, and warts with thin necks on the head or the beard, are treated as the skin of the flesh.

Mishnah Negaim 6:8

The following places in a person do not become unclean on account of a bright spot: the inside of the eye, the inside of the ear, the inside of the nose and the inside of the mouth, wrinkles, wrinkles in the neck, under the breast and the armpit, the sole of the foot, the nails, the head and the beard; and a boil, a burn and a blister that are festering. All these: Do not become unclean on account of negaim Do not combine with other negaim, A nega is not considered to spread into them, Do not become unclean on account of quick flesh, And they do not act to prevent a person from being considered to have turned completely white. If subsequently a bald spot arose in the head or beard, or if a boil, a burn or a blister formed a scar: They may become unclean by negaim, But they do not combine with other negaim, A nega is not considered to spread into them, And they do not become unclean on account of quick flesh. But they do act to prevent a person from being considered to have all turned white. The head and the beard before they have grown hair, and warts with thin necks on the head or the beard, are treated as the skin of the flesh.

Mishnah Negaim 6:8

The following places in a person do not become unclean on account of a bright spot: the inside of the eye, the inside of the ear, the inside of the nose and the inside of the mouth, wrinkles, wrinkles in the neck, under the breast and the armpit, the sole of the foot, the nails, the head and the beard; and a boil, a burn and a blister that are festering. All these: Do not become unclean on account of negaim Do not combine with other negaim, A nega is not considered to spread into them, Do not become unclean on account of quick flesh, And they do not act to prevent a person from being considered to have turned completely white. If subsequently a bald spot arose in the head or beard, or if a boil, a burn or a blister formed a scar: They may become unclean by negaim, But they do not combine with other negaim, A nega is not considered to spread into them, And they do not become unclean on account of quick flesh. But they do act to prevent a person from being considered to have all turned white. The head and the beard before they have grown hair, and warts with thin necks on the head or the beard, are treated as the skin of the flesh.

Mishnah Negaim 11:1

All garments can contract the uncleanness of negaim except those of non-Jews. One who buys garments [with signs of negaim] from non-Jews they must be inspected as if the signs had then first appeared. The hides [of animals] of the sea do not contract the uncleanness of negaim. If one joined to them anything which grows on land, even if it is only a thread or a cord, as long as it is something that is susceptible to uncleanness, they also become susceptible to uncleanness.

Mishnah Negaim 11:1

All garments can contract the uncleanness of negaim except those of non-Jews. One who buys garments [with signs of negaim] from non-Jews they must be inspected as if the signs had then first appeared. The hides [of animals] of the sea do not contract the uncleanness of negaim. If one joined to them anything which grows on land, even if it is only a thread or a cord, as long as it is something that is susceptible to uncleanness, they also become susceptible to uncleanness.

Mishnah Negaim 11:1

All garments can contract the uncleanness of negaim except those of non-Jews. One who buys garments [with signs of negaim] from non-Jews they must be inspected as if the signs had then first appeared. The hides [of animals] of the sea do not contract the uncleanness of negaim. If one joined to them anything which grows on land, even if it is only a thread or a cord, as long as it is something that is susceptible to uncleanness, they also become susceptible to uncleanness.

Mishnah Negaim 11:2

Camel's wool and sheep's wool that have been hackled together: If the majority is camel's hair, they are not susceptible to negaim; But if the majority is sheep's wool they are susceptible to negaim. If it is half and half they are susceptible to negaim. And the same law applies also to linen and hemp that have been hackled together.

Mishnah Negaim 11:2

Camel's wool and sheep's wool that have been hackled together: If the majority is camel's hair, they are not susceptible to negaim; But if the majority is sheep's wool they are susceptible to negaim. If it is half and half they are susceptible to negaim. And the same law applies also to linen and hemp that have been hackled together.

Mishnah Negaim 11:2

Camel's wool and sheep's wool that have been hackled together: If the majority is camel's hair, they are not susceptible to negaim; But if the majority is sheep's wool they are susceptible to negaim. If it is half and half they are susceptible to negaim. And the same law applies also to linen and hemp that have been hackled together.

Mishnah Negaim 11:3

Colored hides and garments are not susceptible to negaim. Houses whether they are colored or not colored, are susceptible to negaim, the words of Rabbi Meir. Rabbi Judah says: hides are like houses. Rabbi Shimon says: those that are naturally [colored] are susceptible to uncleanness but those that are artificially [dyed] are not susceptible to uncleanness.

Mishnah Negaim 11:3

Colored hides and garments are not susceptible to negaim. Houses whether they are colored or not colored, are susceptible to negaim, the words of Rabbi Meir. Rabbi Judah says: hides are like houses. Rabbi Shimon says: those that are naturally [colored] are susceptible to uncleanness but those that are artificially [dyed] are not susceptible to uncleanness.

Mishnah Negaim 11:8

The warp and the woof can contract the uncleanness of negaim immediately. Rabbi Judah says: the warp, only after it has been boiled, but the woof immediately. And bundles of flax after they have been bleached. How much must there be in a coil for it to be capable of contracting the uncleanness of negaim? Enough to weave from it a piece of three fingerbreadths square, either warp or woof, even if it is all warp or all woof. If it consisted of broken threads it does not contract the uncleanness of negaim. Rabbi Judah says: even if the thread was broken only in one place, and he knotted together, it does not contract the uncleanness of negaim.

Mishnah Negaim 11:8

The warp and the woof can contract the uncleanness of negaim immediately. Rabbi Judah says: the warp, only after it has been boiled, but the woof immediately. And bundles of flax after they have been bleached. How much must there be in a coil for it to be capable of contracting the uncleanness of negaim? Enough to weave from it a piece of three fingerbreadths square, either warp or woof, even if it is all warp or all woof. If it consisted of broken threads it does not contract the uncleanness of negaim. Rabbi Judah says: even if the thread was broken only in one place, and he knotted together, it does not contract the uncleanness of negaim.

Mishnah Negaim 11:8

The warp and the woof can contract the uncleanness of negaim immediately. Rabbi Judah says: the warp, only after it has been boiled, but the woof immediately. And bundles of flax after they have been bleached. How much must there be in a coil for it to be capable of contracting the uncleanness of negaim? Enough to weave from it a piece of three fingerbreadths square, either warp or woof, even if it is all warp or all woof. If it consisted of broken threads it does not contract the uncleanness of negaim. Rabbi Judah says: even if the thread was broken only in one place, and he knotted together, it does not contract the uncleanness of negaim.

Mishnah Negaim 11:8

The warp and the woof can contract the uncleanness of negaim immediately. Rabbi Judah says: the warp, only after it has been boiled, but the woof immediately. And bundles of flax after they have been bleached. How much must there be in a coil for it to be capable of contracting the uncleanness of negaim? Enough to weave from it a piece of three fingerbreadths square, either warp or woof, even if it is all warp or all woof. If it consisted of broken threads it does not contract the uncleanness of negaim. Rabbi Judah says: even if the thread was broken only in one place, and he knotted together, it does not contract the uncleanness of negaim.

Mishnah Negaim 11:9

One who winds [a thread] from one coil to another, or from one spool to another, or from the upper beam to the lower beam, and so also in the case of the two sides of a shirt, if a nega appears on the one, the other remains clean. If it appears on the shedded woof or on the standing warp, they become susceptible to the uncleanness of negaim immediately. Rabbi Shimon says: the warp may contract uncleanness only if it is closely ordered.

Mishnah Negaim 11:11

Any object that is susceptible to corpse uncleanness, though not susceptible to midras uncleanness, is still susceptible to negaim uncleanness. For instance: the sail of a ship, a curtain, the forehead band of a hair-net, the wrappings of scrolls, a coiled belt, the straps of a shoe or sandal that are at least as wide as a split bean, Behold these are susceptible to the uncleanness of negaim. A thick cloak on which a nega appeared: Rabbi Eliezer ben Jacob says: unless it appears on the texture and on the stuffing. A skin bottle or a shepherd's leather wallet are inspected in the position in which they are used, and a nega may effectively spread from its inner side to its outer side and from its outer side to its inner side.

Mishnah Negaim 11:11

Any object that is susceptible to corpse uncleanness, though not susceptible to midras uncleanness, is still susceptible to negaim uncleanness. For instance: the sail of a ship, a curtain, the forehead band of a hair-net, the wrappings of scrolls, a coiled belt, the straps of a shoe or sandal that are at least as wide as a split bean, Behold these are susceptible to the uncleanness of negaim. A thick cloak on which a nega appeared: Rabbi Eliezer ben Jacob says: unless it appears on the texture and on the stuffing. A skin bottle or a shepherd's leather wallet are inspected in the position in which they are used, and a nega may effectively spread from its inner side to its outer side and from its outer side to its inner side.

Mishnah Negaim 12:1

All houses may contract negaim uncleanness, except those of non-Jews. If one bought houses from non-Jews, any it must be inspected as if they had then first appeared. A round house, a triangular house, or a house built on a ship, on a raft or on four beams, is not susceptible to negaim uncleanness. But if it was four-sided, even if it was built on four pillars, it is susceptible to uncleanness.

Mishnah Negaim 12:1

All houses may contract negaim uncleanness, except those of non-Jews. If one bought houses from non-Jews, any it must be inspected as if they had then first appeared. A round house, a triangular house, or a house built on a ship, on a raft or on four beams, is not susceptible to negaim uncleanness. But if it was four-sided, even if it was built on four pillars, it is susceptible to uncleanness.

Mishnah Negaim 12:2

A house, one of whose walls was covered with marble, with rock, with bricks or with earth, is pure. A house that did not have in it stones, wood or earth, and a nega appeared in it and afterwards stones, wood and earth were brought into it, it remains clean. So also a garment in which there was no woven part that was three fingerbreadths square and a nega appeared in it and afterwards there was woven into it a piece of cloth three fingerbreadths square, it remains clean. A house does is not susceptible to negaim uncleanness unless there are in it stones, wood and earth.

Mishnah Negaim 12:3

And how many stones must there be in it [for it to be susceptible to negaim]? Rabbi Ishmael says: four. Rabbi Akiva says: eight. For Rabbi Ishmael used to say: a nega is not a cause of uncleanness unless it appeared in the size of two split beans on two stones or on one stone. Rabbi Akiva say: unless it appears in the size of two split beans on two stones, and not on one stone. Rabbi Eliezer son of Rabbi Shimon says: unless it appears in the size of two split beans, on two stones, on two walls in a corner, Its length being that of two split beans and its breadth that of one split bean.

Mishnah Negaim 12:4

[And how much] wood [must be in the wall for it to susceptible]? Enough to be set under the lintel. Rabbi Judah says: it must suffice to make the support at the back of the lintel. [And how much] earth [must be in the wall for it to susceptible]? Such as would suffice to fill up the space between one row of stones and another. The walls of a cattle-trough or the walls of a partition are not susceptible to the uncleanness of negaim. A house in Jerusalem or in any place outside the land of Israel is not susceptible to the uncleanness of negaim.

Mishnah Negaim 12:4

[And how much] wood [must be in the wall for it to susceptible]? Enough to be set under the lintel. Rabbi Judah says: it must suffice to make the support at the back of the lintel. [And how much] earth [must be in the wall for it to susceptible]? Such as would suffice to fill up the space between one row of stones and another. The walls of a cattle-trough or the walls of a partition are not susceptible to the uncleanness of negaim. A house in Jerusalem or in any place outside the land of Israel is not susceptible to the uncleanness of negaim.

Mishnah Negaim 13:1

There are ten [laws concerning the negaim in] houses:(1 + If during the first week a nega became faint or disappeared, it must be scraped and is then clean. (3 + If during the second week it became faint or disappeared, it must be scraped and the owner must bring the birds. If it spread during the first week, the stones must be taken out and the wall scraped and plastered, and another week must be allowed. If it then returned the entire house must be pulled down; If it did not return, the birds must be brought. If it remained unchanged during the first week but spread during the second week, the stones must be taken out and the wall scraped and plastered, and another week must be allowed. If it then returned, the house must be pulled down; If it did not return the birds must be brought. If it remained unchanged in both weeks, the stones must be taken out, and the wall scraped and plastered, and a week must be allowed. If it then returned the house must be pulled down; If it did not return, the birds must be brought. If before cleanness was attained through the birds a new nega appeared, the house must be pulled down; But if it appeared after cleanness through the birds had been attained, it must be inspected as if it had appeared for the first time.

Mishnah Tahorot 4:7

These are the cases of doubtful uncleanness that the sages declared to be clean: A doubt concerning drawn water for a mikveh, A doubt concerning an object of uncleanness that floated upon the water. A doubt concerning liquids as to whether they have contracted uncleanness it is deemed unclean, but if it was whether uncleanness has been conveyed it is deemed clean. A doubt concerning the hands as to whether they have contracted uncleanness, have conveyed uncleanness or have attained cleanness, they are deemed clean. A doubt that arose in a public domain; A doubt concerning an ordinance of the scribes; A doubt concerning non-sacred food; A doubt concerning a sheretz; A doubt concerning negaim; A doubt concerning a nazirite vow; A doubt concerning a first-born; A doubt concerning sacrifices.

Mishnah Tahorot 4:12

"A condition of doubt concerning non-sacred food"--this refers to the cleanness practiced by Pharisees. "A condition of doubt concerning a sheretz" –according [to their condition at] the time they are found. "A condition of doubt concerning negaim" it is deemed clean in the beginning before it had been determined to be unclean, but after it had been determined to be unclean, a condition of doubt is deemed unclean. "A condition of doubt concerning a nazirite vow" [in such a condition of doubt he] is permitted [all that is forbidden to a nazirite]. "A condition of doubt concerning first-borns" whether they are human firstborn or firstborn of cattle, whether the firstborn of an unclean beast or a clean one, for the one who wishes to extract from his fellow bears the burden of proof.