Polygamy being of God, is not specified in the Bible, but it is mentioned as “abominable before me saith the Lord” in the Book of Mormon.
“Behold, David and Solomon truly had many wives, and concubines, which thing was abominable before me, saith the Lord.” - Jacob 2:33
“Wherefore, my brethren, hear me, and hearken to the word of the Lord: For there shall not any man among you have save it be one wife; and concubines he shall have none: For I, the Lord God, delighteth in the chastity of women.” - Jacob 2:36
“For they have not forgotten the commandments of the Lord, which were given unto our fathers, that they should have, save it were one wife: and concubines they should have none; and there should not be whoredoms committed among them.” - Jacob 2:55
I’m not a Mormon, and tend to disregard their dogma out of hand.
RE: Behold, David and Solomon truly had many wives, and concubines, which thing was abominable before me, saith the Lord. - Jacob 2:33
SO, why did Joseph Smith and Brigham Young have many wives?
Then how did the Mormons support polygamy in their original manifestation?