John the Apostle
Revelation 16:2ESV·traditional attribution

So the first angel went and poured out his bowl on the earth, and harmful and painful sores came upon the people who bore the mark of the beast and worshiped its image.

Matthew Henry Presbyterian @wholebiblehenry

We had in the foregoing chapter the great and solemn preparation that was made for the pouring out of the vials; now we have the performance of that work. Here observe, I. That, though every thing was made ready before, yet nothing was to be put in execution without an immediate positive order from God; and this he gave out of the temple, answering the...

Commenting on Revelation 16:1-7

John Gill Reformed Baptist @doctorgill

And the first went,.... The Arabic and Ethiopic versions read, "the first angel", and who undoubtedly is meant, who readily and cheerfully obeyed the orders given him, as did the rest; by this angel cannot be meant Pope Adrian, as Lyra, a Popish interpreter, imagines; for a pope would never hurt the worshippers of the beast, as this angel does; rather some Christian Protestant prince...

Albert Barnes Presbyterian @notesbybarnes

Verse 2. And the first went. Went forth from heaven, where the seat of the vision was laid. And poured out his vial upon the earth. That is, upon the land, in contradistinction from the sea, the rivers, the air, the seat of the beast, the sun, as represented in the other vials.