Jamieson, Fausset and Brown on Revelation 19:15

15. out of his mouth ... sword--(Re 1:16; 2:12, 16). Here in its avenging power, 2Th 2:8, "consume with the Spirit of His mouth" (Is 11:4, to which there is allusion here); not in its convicting and converting efficacy (Ep 6:17; He 4:12, 13, where also the judicial keenness of the sword-like word is included). The Father commits the judgment to the Son.

he shall rule--The HE is emphatic, He and none other, in contrast to the usurpers who have misruled on earth. "Rule," literally, "tend as a shepherd"; but here in a punitive sense. He, who would have shepherded them with pastoral rod and with the golden scepter of His love, shall dash them in pieces, as refractory rebels, with "a rod of iron."

treadeth ... wine-press--(Is 63:3).

of the fierceness and wrath--So Andreas reads. But A, B, Vulgate, Coptic, and Origen read, "of the fierceness (or boiling indignation) of the wrath," omitting "and."

Almighty--The fierceness of Christ's wrath against His foes will be executed with the resources of omnipotence.