1 Corinthians 7:10-12
International Standard Version
10 To married people I give this command (not really I, but the Lord): A wife must not leave her husband. 11 But if she does leave him, she must remain unmarried or else be reconciled to her husband. Likewise, a husband must not abandon[a] his wife.
12 I (not the Lord) say to the rest of you: If a brother has a wife who is an unbeliever and she is willing to live with him, he must not abandon[b] her.Read full chapter