Marriage covenant is a covenant of love. Since God is love (1 John4:8), it is a covenant of God. No one therefore, can put aside the covenant (Matt 19:6). Divorce therefore, goes directly against God; and those who remarry after divorce commit adultery (Luke 16:18). God is therefore, not pleased with the offering of those who divorce their spouse (Malachi 2: 13-14).
God always stays faithful to His covenant with us. When we were unfaithful to Him, He brought us healing by sacrificing His own life. As believers, we are called to love our spouse just as Christ loves us (Eph 5:25). The Lord told Hosea (Hosea 3:1), “Go, show your love to your wife again, though she is loved by another and is an adulteress. Love her as the Lord loves the Israelites, though they turn to other gods and love the sacred raisin cakes.” We therefore, have to be faithful to our covenant with our spouse, even when there is unfaithfulness and hurt; and bring healing to our spouse by our prayers, sacrifices and support.
Divorce is absolutely prohibited by the Gospels (Mk 10:11-12, Luke 6:18; Matthew 5: 31-32). In Matthew’s gospel the exception is for unlawful marriages. The exception in the Greek text is porneia (which means incest or fornication), and not moiceia (which means adultery). The exception is for marriages between close relatives, which according to Mosaic Law (Lv 18:6-18) were unlawful, because, they were considered as incest. According to some authors it also refers to Jewish betrothal process, in which, prior to the marriage, if it was discovered that the bride was not a virgin (had committed fornication), the groom could back out. Such was the case when Joseph had planned to back out, when he found out that Mary was pregnant with Jesus.