A lot of well-respected people in the Bible practiced polygamy.
But scriptures show that man strayed from the original intent that God outlined in Genesis - one man and one woman.
Polygamy recorded in the Bible showed disastrous consequences due to the practice of polygamy - wives fighting and competing against each other, family strife, hostility and envy among siblings over who would have the preeminence, wives competing for having the greater affection from their husband and on and on.
Jesus once and for all in the New Testament said that marriage was to be between one man and one woman when he quoted Genesis saying that “or this cause shall a man leave his father and mother and cleave to his wife and they twain shall be one flesh.”