Revelation 21:12-16

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

There were three gates on the east, three gates on the north, three gates on the south, and three gates on the west.

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

The one who spoke with me had a gold measuring rod to measure the city, its gates, and its wall.

The city is laid out as a square, and its length is as great as the width; and he measured the city with the rod, twelve thousand stadia; its length, width, and height are equal.