John the Apostle
Revelation 18:21ESV·traditional attribution

Then a mighty angel took up a stone like a great millstone and threw it into the sea, saying, “So will Babylon the great city be thrown down with violence, and will be found no more;

Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. A doleful lamentation made by Babylon's friends for her fall; and here observe, 1. Who are the mourners, namely, those who had been bewitched by her fornication, those who had been sharers in her sensual pleasures, and those who had been gainers by her wealth and trade - the kings and the merchants of the earth: the kings of the earth...

Commenting on Revelation 18:9-24

John Gill Reformed Baptist @doctorgill

And the voice of harpers, and musicians, and of pipers and trumpeters,.... Which were for mirth, delight, and pleasure: shall be heard no more at all in thee: the words seem to be taken from Isa 24:8 and may not only regard the loss of every thing that was delightful and pleasant to the ear in private houses, at festivals, and nuptials, and the like...

Albert Barnes Presbyterian @notesbybarnes

Verse 21. And a mighty angel. Barnes on "Re 18:1" This seems, however, to have been a different angel from the one mentioned in , though, like that, he is described as having great power. Took up a stone like a great millstone. On the structure of mills among the ancients, . And cast it into the sea.