Matt 19:9

19:9 except for sexual immorality. The Greek word for “sexual immorality” is fairly broad, including a number of sexual sins besides adultery. In this clause (present also in 5:32 but omitted in Mark 10:11), Jesus recognizes that marital infidelity potentially destroys the marital tie between spouses and is, therefore, ground for legal divorce. However, divorce is not mandatory and reconciliation (see 18:23–35 note) is preferable. See “Marriage and Divorce” at Mal. 2:16.