The Bible lists several types of relationship which it regards as incestuous unions; one list appears in the
Deuteronomic Code, and two lists occur in the
Holiness Code of
Leviticus. These lists only mention relationships with female relatives; excluding
lesbianism, which implies that the list is addressed to men. These lists then compare as follows: One feature of all the lists is that sexual activity between a man and his daughter is not explicitly forbidden. The
Talmud argues that this is because the prohibition was obvious, especially given the proscription against a relationship with a granddaughter. The shortness of the list in Leviticus 20, and especially of that in Deuteronomy, is explained by classical Jewish scholarship as being due to the obviousness of the missing prohibitions. The explicit prohibition against engaging in sexual activity with "both a woman and her daughter" implicitly forbids sexual activity between a man and his daughter, as does the prohibition against engaging in sexual activity with "any that is near of kin". Some
biblical scholars have instead proposed that it was originally in the list but was then accidentally left out from the copy on which modern versions of the text ultimately depend, due to a mistake by the scribe. However, most tribal nations also disliked
exogamous marriage to completely unrelated people.
Abraham married his half-sister
Sarah,
Jacob married his first wife's sister (albeit without his knowledge), and
Amram married his paternal aunt
Jochebed. Apart from the questionable case of a man marrying his daughter, the list in Leviticus 18 roughly produces the same rules as were followed in early
pre-Islamic Arabic culture. == Homosexuality ==