Leviticus 20:11
If a man has sexual intercourse with his father's wife, he has exposed his father's nakedness. Both of them must be put to death; their blood guilt is on themselves.
Deuteronomy 27:20
Cursed is the one who has sexual relations with his father's former wife, for he dishonors his father.' Then all the people will say, 'Amen!'
Deuteronomy 27:23
Cursed is the one who has sexual relations with his mother-in-law.' Then all the people will say, 'Amen!'
Leviticus 18:7-8
You must not expose your father's nakedness by having sexual intercourse with your mother. She is your mother; you must not have intercourse with her.
Amos 2:7
They trample on the dirt-covered heads of the poor; they push the destitute away. A man and his father go to the same girl; in this way they show disrespect for my moral purity.
1 Corinthians 5:1
It is actually reported that sexual immorality exists among you, the kind of immorality that is not permitted even among the Gentiles, so that someone is cohabiting with his father's wife.