1 Corinthians 7:10-17

10And to the married I command, yet not I, but the Lord, Let not the wife depart from her husband: 11But if she shall depart, let her remain unmarried, or be reconciled to her husband: and let not the husband put away his wife. 12But to the rest I speak, not the Lord: If any brother hath a wife that believeth not, and she is pleased to dwell with him, let him not put her away. 13And the woman who hath an husband that believeth not, and if he is pleased to dwell with her, let her not leave him. 14For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy. 15But if the unbelieving departeth, let him depart. A brother or a sister is not under bondage in such cases : but God hath called us to peace.1 16For how knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?2

17But as God hath distributed to every man, as the Lord hath called every one, so let him walk. And so I ordain in all churches.