Isaiah chapter 4 vs 1 talks about 7 women that take hold of one man.  This verse is often quoted to show that polygamy will be practiced in the millennium.  I take you through the scriptures to my understanding that these 7 women are the corrupt churches and the man they try to take hold of is Jesus Christ but only those who have come out of the corrupt churches and are the pure in heart designated in the Book of Revelation in chapter 3 as the Church of Philadelphia are acceptable before the Lord.  All of the other churches must repent or fall.  Revelation 18:4 4  Then I heard another voice from heaven say: “Come out of her, My people, so that you will not share in her sins or contract any of her plagues.