Leviticus 18:17-19

Revised Standard Version Catholic Edition

¹⁷ You shall not uncover the nakedness of a woman and of her daughter, and you shall not take her son’s daughter or her daughter’s daughter to uncover her nakedness; they are your^[a] near kinswomen; it is wickedness. 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.