Leviticus 20:9, 11-12

“Anyone who dishonors father or mother must be put to death. Such a person is guilty of a capital offense.

“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. “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.