It had a great, high wall, with twelve gates, and at the gates twelve angels, and names written on them, the names of the twelve tribes of the sons of Israel.
In context
10And he carried me away in the Spirit to a great, high mountain, and showed me the holy city, Jerusalem, coming down out of heaven from God. 11It shone with the glory of God, and its radiance was like that of a very precious jewel, like a jasper, clear as crystal. 12It had a great, high wall, with twelve gates, and at the gates twelve angels, and names written on them, the names of the twelve tribes of the sons of Israel. 13On the east, three gates; on the north, three gates; on the south, three gates; and on the west, three gates. 14The wall of the city had twelve foundations, and on them were the twelve names of the twelve apostles of the Lamb.