Leviticus 18:18-20

Revised Standard Version

¹⁸ And you shall not take a woman as a rival wife to her sister, uncovering her nakedness while her sister is yet alive.

¹⁹ “You shall not approach a woman to uncover her nakedness while she is in her menstrual uncleanness. ²⁰ And you shall not lie carnally with your neighbor’s wife, and defile yourself with her.