Luke 16:18

AUV(i) 18 “Every person who divorces his wife and marries another woman becomes sexually unfaithful to her [i.e., because he is still regarded by God as married to his first wife. See Matt. 19:9]. And the person who marries someone who has been divorced by her husband commits sexual sin with her [i.e., because she is still rightfully married to her first husband].