Genesis 4:19

“Lamech married two women, one named Adah and the other Zillah.”  Genesis 4:19

Lamech, Cain’s great, great, great grandson, is the first recorded instance of polygamy.  It doesn’t give any indication of what God thought of this – only that it happened.  Was this something that one man decided was a good idea, rationalizing his wandering eyes?  Did God approve of it or just allow it?  So far the only mention God has made to relationships was back in Genesis 2:18 when he said, “I will make a helper as his partner,” and then in chapter 3 he tells Eve, “Your desire will be for your husband, and he will rule over you.”

Any mention before this always indicated one man and one woman.  “For this reason a man will leave his father and mother and will pursue his wife, and they will become one flesh.” Genesis 2:24