John the Apostle
Revelation 21:18ASV·traditional attribution

And the building of the wall thereof was jasper: and the city was pure gold, like unto pure glass.

John Gill Reformed Baptist

And the building of the wall of it was of jasper,.... Which is expressive of the impregnableness, duration, brightness, and glory of salvation by Christ, the jasper being a very hard, durable, and bright stone; and salvation can never be made void, and of none effect; it will last for ever, and in this state will come forth as light, and as a lamp that...

Geneva Bible Notes Reformed

And the building of the wall of it was [of] jasper: and the city [was] pure gold, like unto clear glass. (15) The matter most precious and glittering, which the presence of God makes most glorious.

Matthew Henry Presbyterian

We have already considered the introduction to the vision of the new Jerusalem in a more general idea of the heavenly state; we now come to the vision itself, where observe, I. The person that opened the vision to the apostle - one of the seven angels, that had the seven vials full of the seven last plagues, Rev 21:9.

Commenting on Revelation 21:9-27