Leviticus 20:12

And if any one should lie with his daughter-in-law, let them both be put to death; for they have wrought impiety, they are guilty.

And if a man lie with his daughter in law, both of them shall surely be put to death: they have wrought confusion; their blood shall be upon them.

“‘If a man lies with his daughter-in-law, both of them shall surely be put to death. They have committed a perversion. Their blood shall be upon themselves.