1 Corinthians 7:11-13

(but should she depart, let her remain unmarried, or else be reconciled to her husband); and that the husband leave not his wife. But to the rest say I, not the Lord: If any brother hath an unbelieving wife, and she is content to dwell with him, let him not leave her. And the woman that hath an unbelieving husband, and he is content to dwell with her, let her not leave her husband.