Leviticus 18:15

You are not to have sexual intercourse with your daughter-in-law. She is your son’s wife; you are not to have sex with her.

Leviticus 20:12

If a man sleeps with his daughter-in-law, both of them must be put to death. They have acted perversely; their blood is on their own hands.

Genesis 38:26

Judah recognized them and said, “She is more in the right than I, since I did not give her to my son Shelah.” And he did not know her intimately again.

Ezekiel 22:11

One man within you commits a detestable act with his neighbor’s wife; another wickedly defiles his daughter-in-law; and yet another violates his sister, his father’s daughter.

Genesis 38:18-19

“What should I give you?” he asked.

She answered, “Your signet ring, your cord, and the staff in your hand.” So he gave them to her and slept with her, and she got pregnant by him.

Treasury of Scripture Knowledge

Summary

Thou shalt not uncover the nakedness of thy daughter in law: she is thy son's wife; thou shalt not uncover her nakedness.

Bible References

General references

Leviticus 20:12
If a man sleeps with his daughter-in-law, both of them must be put to death. They have acted perversely; their blood is on their own hands.
Genesis 38:18
“What should I give you?” he asked.

She answered, “Your signet ring, your cord, and the staff in your hand.” So he gave them to her and slept with her, and she got pregnant by him.
Ezekiel 22:11
One man within you commits a detestable act with his neighbor’s wife; another wickedly defiles his daughter-in-law; and yet another violates his sister, his father’s daughter.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.