'The Twelve' in the Bible

It had a wall, great and high; and it had twelve gates, and at the gates twelve angels, and names written on them, which are the names of the twelve tribes of the sons of Israel;

And the wall of the city had twelve foundations, and on them were the names of the twelve apostles of the Lamb.

And the twelve gates were twelve pearls; every gate was of one pearl: and the street of the city was pure gold, like clear glass.