God being immanent and always working with his sheep through means such as answering prayer if they have repented of all their sins.... There is no direct explicit approval or disapproval from God concerning polygamy in the Old Testament that I know of. However in Psalms (i don\'t know where, help me find it.) The psalmist (maybe even David! which may be ironic as you may soon see) claimed that God does not hear the prayers of an unrepentant heart or something like that. Salvation comes through faith and by faith alone. In faith we repent and believe the Gospel. So Hebrews talks about the faith of Abraham and David. Both of which partook in polygamy and were involved with concubines. Now if God disapproved of their lifestyle wouldn\'t he have refuse interaction with them until they repented of it and wouldn\'t the author have showed God\'s anger at the polygamy rather than mere indifference toward it (The subject was never touched)? And if they had saving faith which requires repentance, would they have not repented of their life style? Was it sinful for Jacob to marry Rachel? Since he was already married to Sarah? I can maybe see how one can have many wives and be in good standing of God in the sense that to become the man of \"one wife\" for a polygamous person would mean to divorce... but I can\'t find anywhere of God being angry at David and Abraham for their deeds nor of them repenting of it.