Where is it commanded by God for anyone in the OT to take muliple wives?
5 If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband’s brother shall go in unto her, and take her to him to wife, and perform the duty of an husband’s brother unto her.
Judg. 8: 30
30 And Gideon had threescore and ten sons of his body begotten: for he had many wives.