Revelation 21:15-17

And he that spake with me had for a measure a golden reed to measure the city, and the gates thereof, and the wall thereof. And the city lieth foursquare, and the length thereof is as great as the breadth: and he measured the city with the reed, twelve thousand furlongs: the length and the breadth and the height thereof are equal. And he measured the wall thereof, a hundred and forty and four cubits, according to the measure of a man, that is, of an angel.