Kebra Nagast 82
5And he said, "I give thanks unto God that what He hath given unto me I have expended on my servants.
6But as for thee, my sister Sarah, come, let us go into the land of Egypt in order to save ourselves from death by famine."
8And when they drew nigh [to Egypt] Abraham said unto Sarah, "One thing I must ask of thee, and do thou what I ask of thee"; and Sarah said, "Speak, my lord."
9And he said unto her, "I have heard that the habits of the Egyptians are lawless, and that they live in idolatry and fornication.
10And when they have seen thee they will plot evil against me, and slay me because of the goodliness of thy beautiful form; for there is among them no one that can be compared unto thee.
12And Sarah said, "Thy will shall be done.
13The word which thou tellest me I will speak, and what thou tellest me to do I will do."
15And when the Egyptians saw Abraham and Sarah they marvelled at the beauty of their appearance, for they imagined that they had been brought forth by the same mother.
16And they said unto Abraham, "What is this woman to thee?"
17And Abraham said unto them, "She is my sister."
18And they also asked Sarah "What is this man to thee?"
19And she said unto them, "He is my brother."
20Therefore did the people make a report to Pharaoh that a pair of goodly form had arrived, one a woman and the other a young man, and that there was no one like unto them in all the land.
21And Pharaoh rejoiced, and he sent a message to Abraham, saying, "Give me thy sister that I may betroth her to myself."
22And Abraham pondered in his mind, saying, "If I keep her back he will kill me and take her"; and he said, "Do so, provided that thou dost make me well content."
24And he brought her into his house, and set her upon his bed and Pharaoh the King of Egypt would have companied with her.
27Then Pharaoh stretched out his hands and said unto the Angel, "O lord, forgive me this my sin."
28And the Angel said unto him, "Why dost thou attack the wife of [another] man?"
29And Pharaoh said unto him, "O lord, slay thou not innocent blood.
30For he said unto me `She is my sister,' and therefore I took her to myself innocently.
31What shall I do to deliver myself from thy hands?"
32And the Angel said unto him, "Give Abraham's wife back to him, and give him a gift, and send him away to his own country."
34And Abraham and his wife returned to their country in peace.
35And Sarah said unto Abraham, "I know that I am barren.
36Go thou in to this my handmaiden whom Pharaoh gave unto me; peradventure God will give thee seed in her.
37As for me, my person is shrunk and withered, and the flower of my body hath dried up."
38And she gave `Agar unto him.
39And Abraham went in to `Agar, and she conceived by him, and she brought forth a son and called his name Ishmael, which is, being interpreted, "God hath heard me."
40And afterwards God gave Abraham seed from his wife Sarah and he begat Isaac.
41And afterwards Sarah became jealous of Ishmael, the son of her handmaiden, because he would reach manhood before her son, and she said, "Peradventure he will slay my son and inherit his father's house."
42And Abraham offered up offerings to God and said, "Lord, what shall I do in respect of Ishmael, my son, my firstborn?
43I wish him to live for me before Thee, but Sarah, my sister, is jealous because Thou hast given me seed in her old age."
44Now Ishmael was fourteen years old before Isaac was born.
45And God said unto Abraham, "What Sarah saith is true; cast out the handmaiden with her son Ishmael.
46Let Ishmael live before Me, and I will make him a great nation, and he shall beget twelve nations and shall reign over them.