Leviticus 20:12
And if a man lies with his daughter-in-law, both of them shall surely be put to death. They have performed a perversion; their blood shall be on them.
Leviticus 18:15
You shall not uncover the nakedness of your daughter-in-law. She is your son's wife. You shall not uncover her nakedness.
Leviticus 18:23
And you shall not lie with any animal to defile yourself with it. And a woman shall not stand before an animal to lie down to it. It is a perversion.
Genesis 38:16
And he turned aside to her by the wayside, and said, Come now, let me come in to you. For he did not know that she was his daughter-in-law. And she said, What will you give me, so that you may come in to me?
Genesis 38:18
And he said, What pledge shall I give you? And she said, Your signet, and your bracelet, and your staff that is in your hand. And he gave to her, and came in to her, and she conceived by him.
Deuteronomy 27:23
Cursed is he who lies with his mother-in-law. And all the people shall say, Amen.