Matthew Poole and continuators on 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 .

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.

That believeth not, both in this and v. 13. signifieth, that hath not embraced the Christian Faith, but still remaineth a Pagan.

If there be no other matter of difference betwixt 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 Apostles 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 Apostasie: 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.