MacArthur on divorce

The believing wife has the responsibility to stay with her unbelieving husband. If he wants to maintain the union, she must not divorce him: “A woman who has an unbelieving husband, and he consents to live with her, she must not send her husband away” (1 Cor. 7:13; cf. v. 39; Rom. 7:2–3). Paul went on to say that unsaved spouses benefit from the divine blessings their saved spouses receive from God: “For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband” (1 Cor. 7:14). However, if an unbelieving husband does not want to stay with his believing wife, she does not need to compel him to remain because such an attempt may produce nothing but turmoil, and believers are called to peace: “Yet if the unbelieving one leaves, let him leave; the brother or the sister is not under bondage in such cases, but God has called us to peace” (v. 15). When the bond is broken under such conditions, the believer is free to remarry in the Lord, as in the case of death (v. 39).

John F. MacArthur Jr., 1 Peter, MacArthur New Testament Commentary (Chicago: Moody Publishers, 2004), 177.