Leviticus 18:18-20

American Standard Version

¹⁸ And thou shalt not take a wife to her sister, to be a rival to her, to uncover her nakedness, besides the other in her life-time.

¹⁹ And thou shalt not approach unto a woman to uncover her nakedness, as long as she is ^[a]impure by her uncleanness. ²⁰ And thou shalt not lie carnally with thy neighbor’s wife, to defile thyself with her.