I Corinthians 7:10–16

But to them that are married, not I, but the Lord, commandeth that the wife depart not from her husband. 11And if she depart, that she remain unmarried or be reconciled to her husband. And let not the husband put away his wife. 12For to the rest I speak, not the Lord. If any brother hath a wife that believeth not and she consent to dwell with him: let him not put her away. 13And if any woman hath a husband that believeth not and he consent to dwell with her: let her not put away her husband. 14For the unbelieving husband is sanctified by the believing wife: and the unbelieving wife is sanctified by the believing husband. Otherwise your children should be unclean: but now they are holy. 15But if the unbeliever depart, let him depart. For a brother or sister is not under servitude in such cases. But God hath called us in peace. 16For how knowest thou, O wife, whether thou shalt save thy husband? Or how knowest thou, O man, whether thou shalt save thy wife?