Leviticus 20:9, 11-12

“ ‘Anyone who curses his father or mother must be put to death. He has cursed his father or mother, so he has brought his own death on himself.

If a man has sexual relations with his father’s wife, he has shamed his father, and both the man and his father’s wife must be put to death. They have brought it on themselves. “ ‘If a man has sexual relations with his daughter-in-law, both of them must be put to death. What they have done is not natural. They have brought their own deaths on themselves.