"One of the seven angels who had the seven bowls full of the seven last plagues came and said to me, 'Come, I will show you the bride, the wife of the Lamb.' And he carried me away in the Spirit to a mountain great and high, and showed me the Holy City Jerusalem coming down out of heaven from God. It shone with the glory of God, and its brilliance was like that of a very precious jewel, like a jasper, clear as crystal." (Revelation 21.9-11)✞
The angel carried John of Patmos away in the Spirit to a high mountain. Ezekiel also described a similar experience in Ezekiel 40.2, "In visions of God he took me to the land of Israel and set me on a very high mountain, on whose south side were some buildings that looked like a city."✞
The Holy City Jerusalem shone with the glory of God. The word "light or glory" translated the Greek "Phoster" and was the word used to describe the radiance of the holy city of Jerusalem. "It shone with the glory of God," wrote John of Patmos in his vision. The normal Greek word for "light" is "phos," but "phoster" is the word used in Genesis 1.14 in the Creation story. "And God said, 'Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark sacred times, and days and years.'"
It is later clearly said in Revelation 21.23, that "The city does not need the sun or the moon to shine on it, for the glory of God gives it light, and the Lamb is its lamp." The holy city of Jerusalem needs no heavenly body like the sun or the moon to give it light, because God himself and the Lamb is its light!✞