John the Apostle
Revelation 6:4ESV·traditional attribution

And out came another horse, bright red. Its rider was permitted to take peace from the earth, so that people should slay one another, and he was given a great sword.

Matthew Henry Presbyterian @wholebiblehenry

The next three seals give us a sad prospect of great and desolating judgments with which God punishes those who either refuse or abuse the everlasting gospel. Though some understand them of the persecutions that befell the church of Christ, and others of the destruction of the Jews, they rather seem more generally to represent God's terrible judgments, by which he avenges the quarrel of...

Commenting on Revelation 6:3-8

John Gill Reformed Baptist @doctorgill

And there went out another horse, that was red,.... Which may be an emblem either of the suffering state of the church, being answerable to the Smyrnaean one, as the purity and power of the Gospel, represented in the former seal, may answer to the Ephesine church; or else of those contentions and divisions occasioned among men through the Gospel, which, though of a peaceable...

Albert Barnes Presbyterian @notesbybarnes

Verse 4. And there went out another horse. In this symbol there were, as in the others, several particulars which it is proper to explain in order that we may be able to understand its application. The particular things in the symbol are the following: (a) The horse. . (b) The colour of the horse: another horse that was red. This symbol cannot be mistaken.