Joel 2:31
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.
Joel 3:14
14. The prophet in vision seeing the immense array of nations congregating, exclaims, "Multitudes, multitudes!" a Hebraism for immense multitudes.
valley of decision—that is, the valley in which they are to meet their "determined doom." The same as "the valley of Jehoshaphat," that is, "the valley of judgment" (see on Joe 3:2). Compare Joe 3:12, "there will I sit to judge," which confirms English Version rather than Margin, "threshing." The repetition of "valley of decision" heightens the effect and pronounces the awful certainty of their doom. Malachi 4:1
1. the day cometh . . . burn— (Mal 3:2; 2Pe 3:7). Primarily is meant the judgment coming on Jerusalem; but as this will not exhaust the meaning, without supposing what is inadmissible in Scripture—exaggeration—the final and full accomplishment, of which the former was the earnest, is the day of general judgment. This principle of interpretation is not double, but successive fulfilment. The language is abrupt, "Behold, the day cometh! It burns like a furnace." The abruptness imparts terrible reality to the picture, as if it suddenly burst on the prophet's view.
all the proud—in opposition to the cavil above (Mal 3:15), "now we call the proud (haughty despisers of God) happy." stubble— (Ob 18; Mt 3:12). As Canaan, the inheritance of the Israelites, was prepared for their possession by purging out the heathen, so judgment on the apostates shall usher in the entrance of the saints upon the Lord's inheritance, of which Canaan is the type—not heaven, but earth to its utmost bounds (Ps 2:8) purged of all things that offend (Mt 13:41), which are to be "gathered out of His kingdom," the scene of the judgment being that also of the kingdom. The present dispensation is a spiritual kingdom, parenthetical between the Jews' literal kingdom and its antitype, the coming literal kingdom of the Lord Jesus. neither root nor branch—proverbial for utter destruction (Am 2:9). Malachi 4:5
5. I send you Elijah—as a means towards your "remembering the law" (Mal 4:4).
the prophet—emphatical; not "the Tishbite"; for it is in his official, not his personal capacity, that his coming is here predicted. In this sense, John the Baptist was an Elijah in spirit (Lu 1:16, 17), but not the literal Elijah; whence when asked, "Art thou Elias?" (Joh 1:21), He answered, "I am not." "Art thou that prophet?" "No." This implies that John, though knowing from the angel's announcement to his father that he was referred to by Mal 4:5 (Lu 1:17), whence he wore the costume of Elijah, yet knew by inspiration that he did not exhaustively fulfil all that is included in this prophecy: that there is a further fulfilment (compare Note, see on Mal 3:1). As Moses in Mal 4:4 represents the law, so Elijah represents the prophets. The Jews always understood it of the literal Elijah. Their saying is, "Messiah must be anointed by Elijah." As there is another consummating advent of Messiah Himself, so also of His forerunner Elijah; perhaps in person, as at the transfiguration (Mt 17:3; compare Mt 17:11). He in his appearance at the transfiguration in that body on which death had never passed is the forerunner of the saints who shall be found alive at the Lord's second coming. Re 11:3 may refer to the same witnesses as at the transfiguration, Moses and Elijah; Re 11:6 identifies the latter (compare 1Ki 17:1; Jas 5:17). Even after the transfiguration Jesus (Mt 17:11) speaks of Elijah's coming "to restore all things" as still future, though He adds that Elijah (in the person of John the Baptist) is come already in a sense (compare Ac 3:21). However, the future forerunner of Messiah at His second coming may be a prophet or number of prophets clothed with Elijah's power, who, with zealous upholders of "the law" clothed in the spirit of "Moses," may be the forerunning witnesses alluded to here and in Re 11:2-12. The words "before the . . . dreadful day of the Lord," show that John cannot be exclusively meant; for he came before the day of Christ's coming in grace, not before His coming in terror, of which last the destruction of Jerusalem was the earnest (Mal 4:1; Joe 2:31).