Leviticus 20:12
If a man lies with his daughter-in-law, both must surely be put to death. They have acted perversely; their blood is upon them.

Genesis 38:18, 19, 26
"What pledge should I give you?" he asked. She answered, "Your seal and your cord, and the staff in your hand." So he gave them to her and slept with her, and she became pregnant by him. . . .

Ezekiel 22:11
One man commits an abomination with his neighbor's wife; another wickedly defiles his daughter-in-law; and yet another violates his sister, his own father's daughter.