The Prophet here again repeats, that prayers would not be in vain, provided the Jews truly humbled themselves before God. Then God, he says, will be jealous for his land and spare his people. He confirms what I have already said that God would deal mercifully with his people, because they were his heritage, that is because he had chosen them for himself. For the title of heritage, whence does it proceed except from the gratuitous covenant of God? for the Jews were not more excellent than others, but election was the only fountain from which the Jews had to draw any hope. We now then see why these words, God will be jealous for his land, are added; as though he said "Though this land has been polluted by the wickedness of men, yet God has consecrated it to himself: He will, therefore, regard his own covenant, and thus turn away his face from looking on their sins." He will spare, he says, his people, that is, his chosen people: for, as I have said, the Prophet no doubt ascribes here the safety of the people, and the hope of their safety, to the gratuitous election of God; for the jealousy of God is nothing else but the vehemence and ardor of his paternal love. God could not, indeed, express how ardently he loves those whom he has chosen without borrowing, as it were, what belongs to men. For we know that passions appertain not to him; but he is set forth as a father, who burns with jealousy when he sees his son ill-treated; he acknowledges his own blood, his bowels are excited, -- or, as a husband, who, on seeing dishonor done to his wife, is moved; and though he had been a hundred times offended, he yet forgets every offense; for he regards that sacred union between himself and his wife. Such a character, then, does God assume, that he might the better express how much and how intensely he loves his own elect. Hence he says, God will be jealous for his land. As he has hitherto been inflamed with just wrath, so now a contrary feeling will overcome the former; not that God is agitated by various passions, as I have already said, but this mode of speaking transferred from men, is adopted on account of our ignorance. He afterwards says, God has answered [1] and said to his people, Behold, I will send to you corn, wine, and oil. The Prophet does not here recite what had been done, but, on the contrary, declares, that God in future would be reconciled to them; as though he said, "I have hitherto been a herald of war, and bidden all to prepare themselves for the coming evil: but now I am a messenger to proclaim peace to you; if only you are resolved to turn to God, and to turn unfeignedly, I do now testify to you that God will be propitious to you; and as to your prayers know that they are already heard; that is, know that as soon as they were conceived, they were heard by the Lord." Hence he says, He has answered; that is "If, moved by my exhortation, ye return with sincerity to God, he will meet you, nay, he has already met you; he waits not until ye have done all that ye ought to do; but when he bids you to come to his temple and to weep, he at the same time wipes off your tears, he removes every cause of sorrow and anxiety." God, then, has answered; that is, "I am to you a certain and sufficient witness, that your prayers have been already accepted before God, though, as I have before reminded you, ye have not offered them." And, at the same time, he speaks of the effect, Behold, I will send to you corn, wine, and oil; and ye shall be satisfied. Here, by the effects, he proves that God would be propitious; for want of food was the first evidence of God's displeasure, to be followed by the destruction which the Prophet had threatened. What does he say now? God will restore to you abundance of corn, wine, and oil; and he says further, I will not give you to the Gentiles for a reproach that they may rule over you We now then apprehend the meaning of the Prophet; for he not only promises that God would be placable but also declares that he was already placable; and this he confirms by external tokens; for God would immediately remove the sins of his wrath, and turn them into blessings. Hence he says, He will give you abundance of corn, wine, and oil, so as fully to satisfy you.' As they had perceived that God was angry with them by the sterility of the land, and also by its produce being consumed by chafers, by locusts, and other animals or insects; so now the Lord would testify his love to them by the abounding fruitfulness of every thing. And then he joins another sentence, I will not give you any more for a reproach to the Gentiles. When he says, "any more," he intimates that they had been before exposed to reproach; and we indeed know that they were then suffering many evils; but there remained that destruction of which we have heard. God does then here promise, that they should no more be subject to the reproaches of the Gentiles provided they repented; for the Prophet ever speaks conditionally. It now follows --

Then will the Lord be jealous for His land - Upon repentance, all is changed. Before, God seemed set upon their destruction. It was His great army which was ready to destroy them; He was at its head, giving the word. Now He is full of tender love for them, which resents injury done to them, as done to Himself. The word might more strictly perhaps be rendered, "And the Lord is jealous" . He would show how instantaneous the mercy and love of God for His people is, restrained while they are impenitent, flowing forth upon the first tokens of repentance. The word, "jealous for," when used of God, jealous for My holy Name Ezekiel 39:25, jealous for Jerusalem, Zac 1:14; Zac 8:2, is used, when God resents evil which had been actually inflicted.

Then will the LORD be (m) jealous for his land, and pity his people.
(m) If they repent he shows that God will preserve and defend them with a most fervent affection.

Then will the Lord be jealous for his land,.... Or "zealous" for it; for the honour of it, and the good of its inhabitants, and for the glory of his own name, it being the chief place in the world for his worship and service; and his indignation will be moved against those who have brought desolation on it:
and pity his people; as a father his children, who had suffered much, and had been reduced to great distress by the locusts, or by their enemies: this the prophet foretells would be done upon their repentance, fasting, prayers, and tears; or, as some think, this is a narrative of what had been done, and the prophet was a witness of; that the people meeting together with their princess and priests, and humbling themselves before the Lord, and crying to him, he expressed a zeal and compassion for them, and delivered them out of their troubles; for though their humiliation is not expressed, it may be understood and supposed, as doubtless, it was fact.

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 2:18 and Joel 2:19 contain the historical statement, that in consequence of the penitential prayer of the priests, the Lord displayed His mercy to His people, and gave them a promise, the first part of which follows in Joel 2:19-27. Joel 2:18, Joel 2:19. "Then Jehovah was jealous for His land, and had compassion upon His people. And Jehovah answered, and said." The grammar requires that we should take the imperfects with Vav consec. in these clauses, as statements of what actually occurred. The passages in which imperfects with Vav cons. are either really or apparently used in a prophetic announcement of the future, are of a different kind; e.g., in Joel 2:23, where we find one in a subordinate clause preceded by perfects. As the verb ויּען describes the promise which follows, as an answer given by Jehovah to His people, we must assume that the priests had really offered the penitential and supplicatory prayer to which the prophet had summoned them in Joel 2:17. The circumstance that this is not expressly mentioned, neither warrants us in rendering the verbs in Joel 2:17 in the present, and taking them as statements of what the priest really did (Hitzig), nor in changing the historical tenses in Joel 2:18, Joel 2:19 into futures. We have rather simply to supply the execution of the prophet's command between Joel 2:17 and Joel 2:18. קנּא with ל, to be jealous for a person, i.e., to show the jealousy of love towards him, as in Exodus 39:25; Zac 1:14 (see at Exodus 20:5). חמל as in Exodus 2:6; 1-Samuel 23:21. In the answer from Jehovah which follows, the three features in the promise are not given according to their chronological order; but in order to add force to the description, we have first of all, in Joel 2:19, a promise of the relief of the distress at which both man and beast had sighed, and then, in Joel 2:20, a promise of the destruction of the devastator; and it is not till Joel 2:21-23 that the third feature is mentioned in the further development of the promise, viz., the teacher for righteousness. Then finally, in Joel 2:23-27, the fertilizing fall of rain, and the plentiful supply of the fruits of the ground that had been destroyed by the locusts, are more elaborately described, as the first blessing bestowed upon the people.