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 20:12
If a man lies [intimately] with his daughter-in-law, both of them shall most certainly be put to death; they have committed incest; their blood is on them.
Genesis 38:26
Judah recognized the articles, and said, “She has been more righteous [in this matter] than I, because I did not give her to my son Shelah [as I had promised].” And Judah did not have [intimate] relations with her again.
Ezekiel 22:11
In you one has committed a shameful act with his neighbor’s wife, another has lewdly defiled his daughter-in-law, and another has violated his sister, his father’s daughter.
Genesis 38:18-19
He said, “What pledge shall I give you?” She said, “Your seal and your cord, and the staff that is in your hand.” So he gave them to her and was intimate with her, and she conceived by him.