Mal'akhi (Mal) 2:14-16

Nevertheless, you ask, “Why is this?” Because ADONAI is witness between you and the wife of your youth that you have broken faith with her, though she is your companion, your wife by covenant. And hasn’t he made [them] one [flesh] in order to have spiritual blood-relatives? For what the one [flesh] seeks is a seed from God. Therefore, take heed to your spirit, and don’t break faith with the wife of your youth. “For I hate divorce,” says ADONAI the God of Isra’el, “and him who covers his clothing with violence,” says ADONAI-Tzva’ot. Therefore take heed to your spirit, and don’t break faith.