1 Corinthians 7:14

“For the unbelieving husband is sanctified by the wife, etc.] That is, “by the believing wife”; as the Vulgate Latin and Syriac versions read, and so it is read in some copies; and likewise in the next clause the same is read, by the believing husband; this is a reason given by the apostle why they should live together. This cannot be understood of internal sanctification, which is never the case; an unbeliever cannot be sanctified by a believer in this sense, for such a sanctification is only by the Spirit of God; nor external sanctification, or an outward reformation, which though the unbelieving yoke fellow may sometimes be a means of, yet not always; and besides, the usefulness of one to…”

“sanctified--Those inseparably connected with the people of God are hallowed thereby, so that the latter may retain the connection without impairing their own sanctity (compare Ti1 4:5); nay, rather imparting to the former externally some degree of their own hallowed character, and so preparing the way for the unbeliever becoming at last sanctified inwardly by faith. by . . . by--rather, "in . . . in"; that is, in virtue of the marriage tie between them. by the husband--The oldest manuscripts read, "by the brother." It is the fact of the husband being a "brother," that is, a Christian, though the wife is not so, that sanctifies or hallows the union. else . . . children unclean--that is,…”

“For the unbelieving husband - The husband that is not a Christian; who still remains a pagan, or an impenitent man. The apostle here states reasons why a separation should not take place when there was a difference of religion between the husband and the wife. The first is, that the unbelieving husband is sanctified by the believing wife. And the object of this statement seems to be, to meet an objection which might exist in the mind, and which might, perhaps, be urged by some. “Shall I not be polluted by such a connection? Shall I not be defiled, in the eye of God, by living in a close union with a pagan, a sinner, an enemy of God, and an opposer of the gospel?” This objection was natural,…”

“For the unbelieving husband hath, in many instances, been sanctified by the wife - Else your children would have been brought up heathens; whereas now they are Christians. As if he had said, Ye see the proof of it before your eyes. 1 Corinthians 7:15”

“7:14 By remaining committed to the marriage, the Christian brings holiness to the unbelieving spouse. Such holiness extends to the children, who also benefit from the holiness of a Christian parent (cp. Mal 2:15).”

“the unbelieving husband: Co1 6:15-17; Ezr 9:1, Ezr 9:2; Ti1 4:5; Tit 1:15 else: Ezr 9:2; Isa 52:1; Mal 2:15, Mal 2:16; Act 10:23; Rom 11:16 1 Corinthians 7:15”