This is Ellen White's commentary of Revleation21:9,10

Revelation 21:9-10 (KJV) And there came unto me one of the seven angels which had the seven vials full of the seven last plagues, and talked with me, saying, Come hither, I will shew thee the bride, the Lamb's wife.
And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God,

This quote is by Ellen White
The Great Controversy
Pages 426,427
Holy with is Christ's bride

The Holy City the New Jerusalem, which is the capital and representative of the kingdom, is called "the bride of the Lamb's wife." Said the angle to John: "Come hither, I will show you the bride, the Lamb wife." "He carried me away in the spirit," says the prophet, "and showed me the great city, the holy Jerusalem, descending out of heaven from God" (Revelation21:9,10).