Leviticus 18:15
"You are not to expose the nakedness of your daughter-in-law. She's the wife of your son. You are not to have sexual relations with her.
Leviticus 20:12
"If a man has sexual relations with his daughter-in-law, the two are to be put to death. They've committed a repulsive act. Their guilt will remain their responsibility.
Genesis 38:26
When Judah recognized them, he admitted, "She is more upright than I, because I never did give her my son Shelah." And he never had sex with her again.
Ezekiel 22:11
One of you commits detestable practices with his neighbor's wife. Another sexually defiles his daughter-in-law. Another humiliates his sister, his own father's daughter.
Genesis 38:18-19
Then he asked, "What pledge do you want me to give you?"