“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.”
King James Version (KJV)
7:12 To the rest - Who are married to unbelievers. Speak I - By revelation from God, though our Lord hath not left any commandment concerning it. Let him not put her away - The Jews, indeed, were obliged of old to put away their idolatrous wives, #Ezra 10:3|; but their case was quite different. They were absolutely forbid to marry idolatrous women; but the persons here spoken of were married while they were both in a state of heathenism.
1Co 7:12 To the rest I speak, not the Lord. On the circumstances that follow, the Lord has not directly spoken, as he did on divorce; hence, Paul speaks by inspiration. If any brother hath a wife that believeth not, etc. If either husband or wife is converted, and the other is not, they must not on this account forsake the unbelieving helpmeet, provided he or she is pleased to remain.