7:10-16 Man and wife must not separate for any other cause than what Christ allows. Divorce, at that time, was very common among both Jews and Gentiles, on very slight pretexts. Marriage is a Divine institution; and is an engagement for life, by God's appointment. We are bound, as much as in us lies, to live peaceably with all men, Ro 12:18, therefore to promote the peace and comfort of our nearest relatives, though unbelievers. It should be the labour and study of those who are married, to make each other as easy and happy as possible. Should a Christian desert a husband or wife, when there is opportunity to give the greatest proof of love? Stay, and labour heartily for the conversion of thy relative. In every state and relation the Lord has called us to peace; and every thing should be done to promote harmony, as far as truth and holiness will permit.

15. if … depart—that is, wishes for separation. Translate, "separateth himself": offended with her Christianity, and refusing to live with her unless she renounce it.

brother or a sister is not under bondage—is not bound to renounce the faith for the sake of retaining her unbelieving husband [Hammond]. So De 13:6; Mt 10:35-37; Lu 14:26. The believer does not lie under the same obligation in the case of a union with an unbeliever, as in the case of one with a believer. In the former case he is not bound not to separate, if the unbeliever separate or "depart," in the latter nothing but "fornication" justifies separation [Photius in Æcumenius].

but God hath called us to peace—Our Christian calling is one that tends to "peace" (Ro 12:18), not quarrelling; therefore the believer should not ordinarily depart from the unbelieving consort (1Co 7:12-14), on the one hand; and on the other, in the exceptional case of the unbeliever desiring to depart, the believer is not bound to force the other party to stay in a state of continual discord (Mt 5:32). Better still it would be not to enter into such unequal alliances at all (1Co 7:40; 2Co 6:14).