Revelation 21:15

And he that talked with me ,.... One of the seven angels, Revelation 21:9 for not a man is the measurer of this city, as in Ezekiel 40:3 nor John, as of the temple, Revelation 11:1 but an angel, the same that showed to John this great sight:

had a golden reed ; not a common measuring reed, or rod, as in Ezekiel 40:4 but one covered with gold, denoting the present glorious state of the church, being without spot or wrinkle, or any such thing:

to measure the city ; the new Jerusalem, its length and breadth; see Zechariah 2:1 to show how exactly conformable this church state will be to the rule of God's word, even to perfection: and the gates thereof; to signify who had a right to enter into it, and who not:

and the wall thereof ; its height, it being exceeding high.