1 Corinthians 7:13-16

13And a woman who has an unbelieving husband, and he consents to dwell with her, let her not leave [her] husband.

14For the unbelieving husband is sanctified in the wife, and the unbelieving wife is sanctified in the brother; since [otherwise] indeed your children are unclean, but now they are holy.

15But if the unbeliever go away, let them go away; a brother or a sister is not bound in such [cases], but 1God has called us in peace.

16For what knowest thou, O wife, if thou shalt save thy husband? or what knowest thou, O husband, if thou shalt save thy wife?