Leviticus 20:10-12

10“If a man commits adultery with his neighbor’s wife, both the man and the woman who have committed adultery must be put to death.

11“If a man violates his father by having sex with one of his father’s wives, both the man and the woman must be put to death, for they are guilty of a capital offense.

12“If a man has sex with his daughter-in-law, both must be put to death. They have committed a perverse act and are guilty of a capital offense.