Unlike Luther, Calvin believed the Jews were violating God's original design by engaging in polygamy. According to Calvin:
For he [God in Malachi 2:15] there treats of conjugal fidelity, which the Jews were violating by their polygamy. For the purpose of correcting this fault, he calls that pair, consisting of man and woman, which God in the beginning had joined together, one man, in order that every one might learn to be content with his own wife (John Calvin, Holy Spirit in Genesis 1).
