Question: where in the bible does it say only one wife?
Answer: Gill comments on 1 Corinthians 7 and states that polygamy is unlawful; and that one man is to have but one wife, and to keep to her; and that one woman is to have but one husband, and to keep to him and the wife only has a power over the husband's body, a right to it, and may claim the use of it: this power over each ...