Leviticus 18:18-20

Amplified Bible, Classic Edition

¹⁸ You must not marry a woman in addition to her sister, to be a rival to her, having sexual relations with the second sister when the first one is alive.

¹⁹ Also you shall not have intercourse with a woman during her [menstrual period or similar] uncleanness.

²⁰ Moreover, you shall not lie carnally with your neighbor’s wife, to defile yourself with her.