"To the rest, I say this — and this is me speaking, not a direct word from the Lord: if a brother has a wife who doesn't believe, and she's willing to stay with him, he shouldn't divorce her. If a woman has a husband who doesn't believe, and he's willing to stay with her, she shouldn't divorce him.
The unbelieving husband is set apart because of his wife, and the unbelieving wife is set apart because of her husband. Otherwise your children would be outside the covenant — but as it is, they're included. However, if the unbelieving partner leaves, let them go. In that case, the brother or sister is not bound. God has called you to peace.
Wife, how do you know whether you'll save your husband? Husband, how do you know whether you'll save your wife?"