Actually there is no place in the Bible where it tells men not to marry more than one wife. On the contrary, we find that it was told in the Bible that some prophets had more than one wife.
For example Abraham had Sarah and Hajar, then after Sarah died, he had Keturah and other concubines as mentioned in Genesis 25:1-6. Jacob had 2 wives 2 handmaids:
Gen 32:22 And he rose up that night, and took his two wives, and his two handmaids, and his eleven children, and passed over the ford of the Jabbok.
David had 9 wives, 6 mentioned here:
2Sa 3:2 And unto David were sons born in Hebron: and his first-born was Amnon, of Ahinoam the Jezreelitess; 2Sa 3:3 and his second, Chileab, of Abigail the wife of Nabal the Carmelite; and the third, Absalom the son of Maacah the daughter of Talmai king of Geshur; 2Sa 3:4 and the fourth, Adonijah the son of Haggith; and the fifth, Shephatiah the son of Abital; 2Sa 3:5 and the sixth, Ithream, of Eglah, David’s wife. These were born to David in Hebron.
Plus Michal (2 Sa 6:23), Batheshba (2 Sa 11:26) and Abishag the Shunammite (1Ki 1:3) plus more than 10 concubines:
2Sa 15:16 And the king went forth, and all his household after him. And the king left ten women, that were concubines, to keep the house.
Also Solomon had 1000 women 700 concubines and 300 wives, as in 1Ki 11:1-11, and what the Bible condemned wasn’t having women, but that these women were disbelievers so they drove him (We Muslims totally reject that blasphemy that Solomon worshipped idols, he is innocent from this)
The Old Testament clearly sanctions it:
Deu 21:15 If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the first-born son be hers that was hated;
So it tells that if a man had two wives, and didn’t say that it is forbidden.
And after the Bible tells what David made with Batheshba (Which we also consider as a blasphemy against God’s prophet David), it tells that God said to him:
2Sa 12:8 and I gave thee thy master’s house, and thy master’s wives into thy bosom, and gave thee the house of Israel and of Judah; and if that had been too little, I would have added unto thee such and such things.
So the Bible tells that if David needed more (which includes women), and not to commit adultery, God would have gave him, and let him do it.
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