'The Twelve' in the Bible

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

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

And the twelve gates were twelve pearls; each one of the gates was a single pearl. And the street of the city was pure gold, like transparent glass.