An angel showed John the city of God, the New Jerusalem, that was coming down out of heaven from God, shining with his glory, having a huge wall with twelve gates and twelve huge foundation stones.

Revelation 21:10-14

10 Then, while God’s Spirit controlled me, the angel took/carried me to the top of a very high mountain. He showed me God’s holy city, the New Jerusalem. It was coming down out of heaven from God. 11 It was shining with his glory. The city was shining like a very precious jasper stone shines, and it was clear like crystal. 12 Around the city was a very high wall. The wall had twelve gates. An angel was at each gate. The names of the twelve tribes of Israel were written {God had written the names of the twelve tribes of Israel} over the gates. Each gate had the name of one tribe. 13 Three gates were on the east side, three gates were on the north side, three gates were on the south side, and three gates were on the west side. 14 The wall of the city had twelve foundation stones. On each foundation stone was the name of one of the twelve apostles of Jesus, the one who is like a lamb.