The word of God teaches us that monogamy has been the order since the beginning of the Law of Christ. Divorce is permissible only when a life partner has committed adultery.

Even then none of the two should be married to a new partner while both are yet alive - Matt. 5:31-32, 19:9; Mark 2:13-16; Gen. 2:18; Matt. 19:4-6; 1:18-20; I Cor. 7:10-11.