Leviticus 18:18-20 New Revised Standard Version, Anglicised Catholic Edition (NRSVACE)
18 And you shall not take[a] a woman as a rival to her sister, uncovering her nakedness while her sister is still alive.
19 You shall not approach a woman to uncover her nakedness while she is in her menstrual uncleanness. 20 You shall not have sexual relations with your kinsman’s wife, and defile yourself with her.
Leviticus 18:18-20 New International Version (NIV)
18 “‘Do not take your wife’s sister as a rival wife and have sexual relations with her while your wife is living.
19 “‘Do not approach a woman to have sexual relations during the uncleanness of her monthly period.
20 “‘Do not have sexual relations with your neighbor’s wife and defile yourself with her.