Revelation 21:16-18

Young's Literal Translation

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;