John the Apostle
Revelation 19:11ESV·traditional attribution

Then I saw heaven opened, and behold, a white horse! The one sitting on it is called Faithful and True, and in righteousness he judges and makes war.

Matthew Henry Presbyterian @wholebiblehenry

No sooner was the marriage solemnized between Christ and his church by the conversion of the Jews than the glorious head and husband of the church is called out to a new expedition, which seems to be the great battle that was to be fought at Armageddon, foretold Rev 16:16. And here observe, I. The description of the great Commander, 1.

Commenting on Revelation 19:11-21

John Gill Reformed Baptist @doctorgill

And I saw heaven opened,.... This vision refers not to the same time the first seal does, Rev 6:2 for though a white horse, with a rider on it, is seen here, as there; that respects the first times of the Gospel, this the latter part of the dispensation of it; nor to the war in heaven between Michael and the dragon, and their angels...

Albert Barnes Presbyterian @notesbybarnes

Verse 11. And I saw heaven opened. He saw a new vision, as if an opening were made through the sky, and he was permitted to look into heaven. . And behold, a white horse. On the white horse as a symbol, .