Leviticus 18:16-18

Amplified Bible, Classic Edition

¹⁶ You shall not have intercourse with your brother’s wife; she belongs to your brother.

¹⁷ You shall not marry a woman and her daughter, nor shall you take her son’s daughter or her daughter’s daughter to have intercourse; they are [her] near kinswomen; it is wickedness and an outrageous offense.

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.