Revelation 21:14-18

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.

And he measured its wall, 144 cubits, by human measurements, which are also angelic measurements.

The material of the wall was jasper; and the city was pure gold, like clear glass.