KJV Leviticus 18:17–18 regulates polygamy.
Leviticus 18:17–18, Old Testament, The Church of Jesus Christ of Latter Day Saints, accessed April 27, 2023
17 Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son’s daughter, or her daughter’s daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.
18 Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.