But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God has called us to peace.
All Commentaries on 1 Corinthians 7:15 Go To 1 Corinthians 7
John Chrysostom
AD 407
If an unbeliever wants his partner to join him in sacrificing to idols, it is better for the marriage to be annulled, so that there may be no breach in godliness.