Joel 2:18
18. Then—when God sees His people penitent.
be jealous for his land—as a husband jealous of any dishonor done to the wife whom he loves, as if done to himself. The Hebrew comes from an Arabic root, "to be flushed in face" through indignation. Joel 2:31-32
30, 31. As Messiah's manifestation is full of joy to believers, so it has an aspect of wrath to unbelievers, which is represented here. Thus when the Jews received Him not in His coming of grace, He came in judgment on Jerusalem. Physical prodigies, massacres, and conflagrations preceded its destruction [JOSEPHUS, Wars of the Jews]. To these the language here may allude; but the figures chiefly symbolize political revolutions and changes in the ruling powers of the world, prognosticated by previous disasters (Am 8:9; Mt 24:29; Lu 21:25-27), and convulsions such as preceded the overthrow of the Jewish polity. Such shall probably occur in a more appalling degree before the final destruction of the ungodly world ("the great and terrible day of Jehovah," compare Mal 4:5), of which Jerusalem's overthrow is the type and earnest.
32. call on . . . name of . . . Lord—Hebrew, JEHOVAH. Applied to Jesus in Ro 10:13 (compare Ac 9:14; 1Co 1:2). Therefore, Jesus is JEHOVAH; and the phrase means, "Call on Messiah in His divine attributes."
shall be delivered—as the Christians were, just before Jerusalem's destruction, by retiring to Pella, warned by the Saviour (Mt 24:16); a type of the spiritual deliverance of all believers, and of the last deliverance of the elect "remnant" of Israel from the final assault of Antichrist. "In Zion and Jerusalem" the Saviour first appeared; and there again shall He appear as the Deliverer (Zec 14:1-5). as the Lord hath said—Joel herein refers, not to the other prophets, but to his own words preceding. call—metaphor from an invitation to a feast, which is an act of gratuitous kindness (Lu 14:16). So the remnant called and saved is according to the election of grace, not for man's merits, power, or efforts (Ro 11:5).