Albert Barnes Commentary Revelation 19:15

"And out of his mouth proceedeth a sharp sword, that with it he should smite the nations: and he shall rule them with a rod of iron: and he treadeth the winepress of the fierceness of the wrath of God, the Almighty." — Revelation 19:15 (ASV)

And out of his mouth goeth a sharp sword. See Barnes on Revelation 1:16.

In that place the sword seems to be an emblem of his words or doctrines, as penetrating the hearts of men; here it is the emblem of a work of destruction inflicted on his foes.

That with it he should smite the nations. The nations that were opposed to him; namely, those especially who were represented by the beast and the false prophet, Revelation 19:18–20.

And he shall rule them with a rod of iron. See Barnes on Revelation 2:27; See Barnes on Revelation 12:5.

And he treadeth the wine-press of the fierceness and wrath of Almighty God. This language is probably derived from Isaiah 63:1-4. See it explained in Barnes on Isaiah 63:1 and following, and Barnes on Revelation 14:19. See Barnes on Revelation 14:20.

It means here that his enemies would be certainly crushed before him—as grapes are crushed under the feet of him that treads in the wine-vat.