The Book of the Cave of Treasures 46

1Now, as concerning what the Apostle said, “ there was no beginning to his days, and no end to his life’ (Heb. vii. 3) because when Shem, the son of Noah, took away Melchisedek from his parents, no word is said as to how old he was when he went up from the Fast, and it is not said how old he was at the time of his departure from this world. Now, he was the son of Malakh, the son of Arpakhshar, the son of Shem, and he was not the son of one of the Patriarchs. And the Apostle said that none of his father’s family had ever ministered at the altar (Heb. vii. 6). The name of his father is not written in the genealogies, because Matthew and Luke, the Evangelists [only] wrote down the [names of the] Fathers (in chief, i.e. Patriarchs]; and for this reason neither the name of his father, nor the name of his mother, is known. The Apostle did not say that he had no parents, but [only] that they were not written down in Matthew and Luke.
See also: Hebrews 7:3