Leviticus 18:18-20

Complete Jewish Bible

¹⁸ You are not to take a woman to be a rival with her sister and have sexual relations with her while her sister is still alive. ¹⁹ You are not to approach a woman in order to have sexual relations with her when she is unclean from her time of niddah. ²⁰ You are not to go to bed with your neighbor’s wife and thus become unclean with her.