Leviticus 20:12
And if a man lies with his daughter-in-law, both of them shall surely be put to death: they have committed perversion; their blood shall be upon 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
Neither shall you lie with any animal to defile yourself with it: neither shall any woman stand before an animal to lie down with it: it is perversion.
Genesis 38:16
And he turned unto her by the way, and said, Go to, I pray you, let me come in unto you; (for he knew not that she was his daughter-in-law.) And she said, What will you give me, that you may come in unto me?
Genesis 38:18
And he said, What pledge shall I give you? And she said, Your signet, and your bracelets, and your staff that is in your hand. And he gave it to her, and came in unto her, and she conceived by him.
Deuteronomy 27:23
Cursed be he that lies with his mother-in-law. And all the people shall say, Amen.