Proclaim ye this among the Gentiles; Prepare war, wake up the mighty men, let all the men of war draw near; let them come up:

Wesley's Notes

3:9 This - These things which I will do to the enemies of God's people. The Gentiles - The Assyrians, Chaldeans, and Grecians successively. Prepare war - Make ready for wars against the enemies of my people.

King James Translators' Notes

Prepare: Heb. Sanctify

Scofield Reference Notes

[1] Prepare war

Verses 9-14 refer to Armageddon; verses 15,16 are parallel with Joel 2:30-32. From verses 9 to 16 we have a resume of Joel 2:9-32.

Jamieson-Fausset-Brown Bible Commentary

9. The nations hostile to Israel are summoned by Jehovah to "come up" (this phrase is used because Jerusalem was on a hill) against Jerusalem, not that they may destroy it, but to be destroyed by the Lord (Eze 38:7-23; Zec 12:2-9; 14:2, 3).

Prepare war-literally, sanctify war: because the heathen always began war with religious ceremonies. The very phrase used of Babylon's preparations against Jerusalem (Jer 6:4) is now used of the final foes of Jerusalem. As Babylon was then desired by God to advance against her for her destruction, so now all her foes, of whom Babylon was the type, are desired to advance against her for their own destruction.

Matthew Henry's Concise Commentary

3:9-17 Here is a challenge to all the enemies of God's people. There is no escaping God's judgments; hardened sinners, in that day of wrath, shall be cut off from all comfort and joy. Most of the prophets foretell the same final victory of the church of God over all that oppose it. To the wicked it will be a terrible day, but to the righteous it will be a joyful day. What cause have those who possess an interest in Christ, to glory in their Strength and their Redeemer! The acceptable year of the Lord, a day of such great favour to some, will be a day of remarkable vengeance to others: let every one that is out of Christ awake, and flee from the wrath to come.