Leviticus 18:17-19

EasyEnglish Bible

¹⁷ Do not have sex with both a woman and her daughter. Do not have sex with her son's daughter or with her daughter's daughter. They are her near relatives. It would be an evil thing to do.

¹⁸ Do not marry your wife's sister as a second wife. If your wife is still alive, do not have sex with her sister.

¹⁹ Do not have sex with a woman at the time when she bleeds each month. She is unclean during that time.