Revelation 21:14-16

Living Bible

¹⁴ The walls had twelve foundation stones, and on them were written the names of the twelve apostles of the Lamb.

¹⁵ The angel held in his hand a golden measuring stick to measure the city and its gates and walls. ¹⁶ When he measured it, he found it was a square as wide as it was long; in fact it was in the form of a cube, for its height was exactly the same as its other dimensions—1,500 miles each way.