To be even more accurate, polygamy was a recognized marriage form among OT Jews.

Who do NOT follow what the OT has to SAY about the subject!

Kinda like...

The Doctrine and Covenants

Section 132

Revelation given through Joseph Smith the Prophet, at Nauvoo, Illinois, recorded 12 July 1843, relating to the new and everlasting covenant, including the eternity of the marriage covenant, and also the plurality of wives (see History of the Church, 5:501–7). Although the revelation was recorded in 1843, it is evident from the historical records that the doctrines and principles involved in this revelation had been known by the Prophet since 1831.

58–66, Laws governing the plurality of wives are set forth.

58 Now, as touching the law of the ^apriesthood, there are many things pertaining thereunto.

59 Verily, if a man be called of my Father, as was ^aAaron, by mine own voice, and by the voice of him that ^bsent me, and I have endowed him with the ^ckeys of the power of this priesthood, if he do anything in my name, and according to my law and by my word, he will not commit ^dsin, and I will justify him.

60 Let no one, therefore, set on my servant Joseph; for I will justify him; for he shall do the sacrifice which I require at his hands for his transgressions, saith the Lord your God.

61 And again, as pertaining to the law of the priesthood—if any man espouse a virgin, and desire to espouse ^aanother, and the first give her consent, and if he espouse the second, and they are virgins, and have vowed to no other man, then is he justified; he cannot commit adultery for they are given unto him; for he cannot commit adultery with that that belongeth unto him and to no one else.

62 And if he have ^aten virgins given unto him by this law, he cannot commit adultery, for they belong to him, and they are given unto him; therefore is he justified.

63 But if one or either of the ten virgins, after she is espoused, shall be with another man, she has committed adultery, and shall be destroyed; for they are given unto him to ^amultiply and replenish the earth, according to my commandment, and to fulfil the promise which was given by my Father before the foundation of the world, and for their exaltation in the eternal worlds, that they may bear the souls of men; for herein is the work of my Father continued, that he may be ^bglorified.

64 And again, verily, verily, I say unto you, if any man have a wife, who holds the keys of this power, and he teaches unto her the law of my priesthood, as pertaining to these things, then shall she believe and administer unto him, or she shall be destroyed, saith the Lord your God; for I will destroy her; for I will magnify my name upon all those who receive and abide in my law.

65 Therefore, it shall be lawful in me, if she receive not this law, for him to receive all things whatsoever I, the Lord his God, will give unto him, because she did not believe and administer unto him according to my word; and she then becomes the transgressor; and he is exempt from the law of Sarah, who administered unto Abraham according to the law when I commanded Abraham to take ^aHagar to wife.

66 And now, as pertaining to this law, verily, verily, I say unto you, I will reveal more unto you, hereafter; therefore, let this suffice for the present. Behold, I am Alpha and Omega. Amen.