Treasury of Scripture Knowledge
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.
While Israel was living in that land, Reuben had sexual relations with Bilhah, his father's concubine, and Israel heard about it. Jacob had twelve sons:
You are destructive like water and will not excel, for you got on your father's bed, then you defiled it -- he got on my couch!
A man may not marry his father's former wife and in this way dishonor his father.
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!'
2 Samuel 16:21
Ahithophel replied to Absalom, "Have sex with your father's concubines whom he left to care for the palace. All Israel will hear that you have made yourself repulsive to your father. Then your followers will be motivated to support you."
They have sex with their father's wife within you; they violate women during their menstrual period within you.
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.