Revelation 21:17 Revelation 21:17-18 And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel. 18 And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass. The wall of a city is for safety and defence, \ See KNOLLYS: Revelation 21:12 & See KNOLLYS: Revelation 21:15 & See KNOLLYS: Revelation 21:16; by exact measure.