Isaiah 63:1

Who is this that cometh from Edom, with dyed garments from Bozrah? this that is glorious in his apparel, travelling in the greatness of his strength? I that speak in righteousness, mighty to save.

Messiah approaching Jerusalem, after having avenged His people on His and their enemies, is represented under imagery taken from the destruction of "Edom," the type of the last and most bitter foes of God and His people, (see Isaiah 34:5, etc.)

Who (is) this that cometh from Edom, with dyed garments from Bozrah? - the question of the prophet in prophetic vision.

Dyed - scarlet with blood (Isaiah 63:2; Revelation 19:13).

Bozrah - (note, Isaiah 34:6.)

This (that is) glorious in his apparel, traveling in the greatness of his strength? "Traveling" [ tso`eh (H6808)]. So the Syriac and Vulgate, marching majestically, stately-literally, throwing back the head (Gesenius).

I that speak in righteousness mighty to save - answer of Messiah. I who have in faithfulness given a promise of deliverance am now about to fulfill it. Not as Maurer (in opposition to the Vulgate, Septuagint, Chaldaic Arabic, and Syriac, which support the English version), 'I that speak of righteousness' (Isaiah 45:19; Isaiah 46:13): salvation being meant as the result of His "righteousness."

Save. The same Messiah that destroys the unbeliever saves the believer.