John the Apostle
Revelation 9:17BSB·traditional attribution

Now the horses and riders in my vision looked like this: The riders had breastplates the colors of fire, sapphire, and sulfur. The heads of the horses were like the heads of lions, and out of their mouths proceeded fire, smoke, and sulfur.

Matthew Henry Presbyterian @wholebiblehenry

Here let us consider the preface to this vision, and then the vision itself. I. The preface to this vision: A voice was heard from the horns of the golden altar, Rev 9:13, Rev 9:14. Here observe, 1. The power of the church's enemies is restrained till God gives the word to have them turned loose. 2.

Commenting on Revelation 9:13-21

John Gill Reformed Baptist @doctorgill

And thus I saw the horses in the vision, and them that sat on them,.... In such numbers, and with horsemen on them, and in such order, and in appearance, as follows: having breastplates of fire, and of jacinth and brimstone; which may be understood either literally of their external breastplates, which being of polished iron, according to the custom of these people, looked at...

Albert Barnes Presbyterian @notesbybarnes

Verse 17. And thus I saw the horses in the vision. That is, he saw them as he proceeds to describe them, for the word thus--ουτως--refers to what follows. Compare Rob. Lex. on the word, (b,) and see . Professor Stuart, however, refers it to what precedes.