1 Corinthians 7:10-14

J.B. Phillips New Testament

^10-11 To those who are already married my command, or rather, the Lord’s command, is that the wife should not leave her husband. But if she is separated from him she should either remain unattached or else be reconciled to her husband. A husband is not, in similar circumstances, to divorce his wife.

Advice over marriage between Christian and pagan

^12-14 To other people my advice (though this is not a divine command) is this. For a brother who has a non-Christian wife who is willing to live with him he should not divorce her. A wife in a similar position should not divorce her husband. For the unbelieving husband is, in a sense, consecrated by being joined to the person of his wife; the unbelieving wife is similarly “consecrated” by the Christian brother she has married. If this were not so then your children would bear the stains of paganism, whereas they are actually consecrated to God.