Revelation 21:15

12 having also a wall great and high, having twelve gates, and at the gates twelve messengers, and names written thereon, which are [those] of the twelve tribes of the sons of Israel,

13 at the east three gates, at the north three gates, at the south three gates, at the west three gates;

14 and the wall of the city had twelve foundations, and in them names of the twelve apostles of the Lamb.

15 And he who is speaking with me had a golden reed, that he may measure the city, and its gates, and its wall;

16 and the city lieth square, and the length of it is as great as the breadth; and he did measure the city with the reed -- furlongs twelve thousand; the length, and the breadth, and the height, of it are equal;

17 and he measured its wall, an hundred forty-four cubits, the measure of a man, that is, of the messenger;

18 and the building of its wall was jasper, and the city [is] pure gold -- like to pure glass;