Leviticus 20:10-12

10If a man commits adultery with his neighbor’s wife, both the adulterer and the adulteress must be put to death.

11If 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.

12If a man has sexual intercourse with his daughter-in-law, both of them must be put to death. They have committed perversion; their blood guilt is on themselves.