'The Twelve' in the Bible

It has a massive, high wall with twelve gates, with twelve angels at the gates, and the names of the twelve tribes of the nation of Israel are written on the gates.

The wall of the city has twelve foundations, and on them are the twelve names of the twelve apostles of the Lamb.

And the twelve gates are twelve pearls -- each one of the gates is made from just one pearl! The main street of the city is pure gold, like transparent glass.