Leviticus 18:7

The nakedness of thy father, or the nakedness of thy mother. — The rendering of the Authorised Version is based upon the interpretation which obtained during the second Temple, according to which this injunction is addressed both to the daughter and the son. The daughter must not marry or have commerce with the father, nor the son with the mother. Hence the Chaldee Version of Jonathan translates it “the woman shall not lie with her father, and the man shall not lie with his mother.” Accordingly the case here contemplated is that of Lot’s daughters (Genesis 19:31). This passage may, however, be translated literally, the nakedness of thy father, and the nakedness of thy mother shalt thou not uncover. That is, they being both one flesh, the nakedness of the one is the nakedness of the other. Amongst the Persians and other eastern nations, marriage between son and mother was allowed.