1 Corinthians 7:12-16
7:12 To the rest I say – I, not the Lord – if a brother has a wife who is not a believer and she is happy to live with him, he should not divorce her.
7:13 And if a woman has a husband who is not a believer and he is happy to live with her, she should not divorce him.
7:14 For the unbelieving husband is sanctified because of the wife, and the unbelieving wife because of her husband. Otherwise your children are unclean, but now they are holy.
7:15 But if the unbeliever wants a divorce, let it take place. In these circumstances the brother or sister is not bound. God has called you in peace.
7:16 For how do you know, wife, whether you will bring your husband to salvation? Or how do you know, husband, whether you will bring your wife to salvation?