“Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.”
King James Version (KJV)
18:18 Thou shalt not take a wife to her sister - Perhaps this text doth not simply forbid the taking one wife to another, but the doing it in such a manner or for such an end, that he may vex or punish, or revenge himself of the former; which probably was a common motive amongst that hardhearted people to do so.