1 Corinthians 7:13-16

13And a woman who has an unbelieving husband, and he consents to live with her, she must not 1send her husband away. 14For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through 2her believing husband; for otherwise your children are unclean, but now they are 3holy. 15Yet if the unbelieving one leaves, let him leave; the brother or the sister is not under bondage in such cases, but God has called 4us 56to peace. 16For how do you know, O wife, whether you will 7save your husband? Or how do you know, O husband, whether you will save your wife?