But to the rest speak I, not the Lord; either as to the other part of your Epistle, or as to the cases of the rest mentioned in your Epistle, I shall give you my advice so far as I am instructed by the Holy Spirit of God, though our Lord Jesus Christ hath set no certain rule concerning them. If any brother hath a wife that believeth not: that believeth not, both here and 1 Corinthians 7:13, signifieth, that hath not embraced the Christian faith, but still remaineth a pagan. And she be pleased to dwell with him; if there be no other matter of difference between such persons, save only in matter of religion, let him not for that put her away. If a Christian man or woman had their choice to make, it were unlawful for either of them to make choice of a pagan for their yoke-fellow; but if, after marriage, either the husband or the wife embraceth the Christian faith, the other correlate still abiding a pagan, their difference in religion is not a sufficient ground for a separation: this seemeth to be the apostle's meaning. The case seemeth a little different in the opinion of some divines, when the idolater or idolatress blasphemeth God and the true religion, and is continually tempting the correlate to apostacy: but it is hard to determine against the plain precept of so great an apostle, especially considering the reason by which he backeth his precept.
Related Commentaries of 1 Corinthians 7:12
1 Corinthians 7:12
12 But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.