Bible verses about "fidelity" | WNT

¹⁸ Every man who divorces his wife and marries another commits adultery; and he who marries her when so divorced from her husband commits adultery.

⁴ Love is patient and kind. Love knows neither envy nor jealousy. Love is not forward and self-assertive, nor boastful and conceited. ⁵ She does not behave unbecomingly, nor seek to aggrandize herself, nor blaze out in passionate anger, nor brood over wrongs. ⁶ She finds no pleasure in injustice done to others, but joyfully sides with the truth. ⁷ She knows how to be silent. She is full of trust, full of hope, full of patient endurance.

⁴ Let marriage be held in honour among all, and let the marriage bed be unpolluted; for fornicators and adulterers God will judge.