Is polygamy a sin

I have heard people argue that polygamy is not specifically listed as a sin in the Bible, and it should be allowed today because certain people in the Bible had multiple wives. What does the Bible really say about this subject?

Our Messiah (quoting the Torah) said, “the two shall become one”, indicating that marriage is between two people (not three or more). He was making reference to what happened in the garden when God created one woman for Adam to be his wife. He pulled her from his side, and gave her back to him as a bride. This was God’s plan for marriage from the beginning. The unity between a man and woman in monogamy represents the love and faithfulness that God has for his people.

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