1 Corinthians 7:13-16

13And a woman who has a husband who does not believe, if he is willing to live with her, let her not divorce him.

14For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband; otherwise your children would be unclean, but now they are holy.

15But if the unbeliever departs, let him depart; a brother or a sister is not under bondage in such cases. But God has called us to peace.

16For how do you know, O wife, whether you will save your husband? Or how do you know, O husband, whether you will save your wife?