Leviticus 20:12
And if a man lies with his daughter-in-law, both of them shall surely be put to death; they have wrought mixture; their blood shall be upon them.
Leviticus 18:15
Thou shalt not uncover the nakedness of thy daughter-in-law; she is thy son's wife; thou shalt not uncover her nakedness.
Leviticus 18:23
Neither shalt thou lie with any beast to defile thyself therewith; neither shall any woman stand before a beast to join herself with it; it is mixture.
Genesis 38:16
And he turned unto her by the way and said, Come now, I pray thee, let me come in unto thee (for he knew not that she was his daughter-in-law). And she said, What wilt thou give me that thou may come in unto me?
Genesis 38:18
Then he said, What pledge shall I give thee? And she said, Thy signet and thy mantel and thy staff that is in thine hand. And he gave them to her, and came in unto her, and she conceived by him.
Deuteronomy 27:23
Cursed is he that lies with his mother-in-law. And all the people shall say, Amen.