1 Corinthians 7:11-13

(but if she does, she should remain unmarried or else be reconciled to her husband), and the husband should not divorce his wife. To the rest I say (I, not the Lord) that if any brother has a wife who is an unbeliever, and she consents to live with him, he should not divorce her. If any woman has a husband who is an unbeliever, and he consents to live with her, she should not divorce him.