12 That is why the Lord says, "Turn to me now, while there is time. Give me your hearts. Come with fasting, weeping, and mourning. 13 Don't tear your clothing in your grief, but tear your hearts instead." Return to the Lord your God, for he is merciful and compassionate, slow to get angry and filled with unfailing love. He is eager to relent and not punish. 14 Who knows? Perhaps he will give you a reprieve, sending you a blessing instead of this curse. Perhaps you will be able to offer grain and wine to the Lord your God as before. 15 Blow the ram's horn in Jerusalem! Announce a time of fasting; call the people together for a solemn meeting. 16 Gather all the people- the elders, the children, and even the babies. Call the bridegroom from his quarters and the bride from her private room. 17 Let the priests, who minister in the Lord 's presence, stand and weep between the entry room to the Temple and the altar. Let them pray, "Spare your people, Lord ! Don't let your special possession become an object of mockery. Don't let them become a joke for unbelieving foreigners who say, 'Has the God of Israel left them?'"
Matthew Henry's Commentary on Joel 2:12-17
Commentary on Joel 2:1-14
(Read Joel 2:1-14)
The priests were to alarm the people with the near approach of the Divine judgments. It is the work of ministers to warn of the fatal consequences of sin, and to reveal the wrath from heaven against the ungodliness and unrighteousness of men. The striking description which follows, shows what would attend the devastations of locusts, but may also describe the effects from the ravaging of the land by the Chaldeans. If the alarm of temporal judgments is given to offending nations, how much more should sinners be warned to seek deliverance from the wrath to come! Our business therefore on earth must especially be, to secure an interest in our Lord Jesus Christ; and we should seek to be weaned from objects which will soon be torn from all who now make idols of them. There must be outward expressions of sorrow and shame, fasting, weeping, and mourning; tears for trouble must be turned into tears for the sin that caused it. But rending the garments would be vain, except their hearts were rent by abasement and self-abhorrence; by sorrow for their sins, and separation from them. There is no question but that if we truly repent of our sins, God will forgive them; but whether he will remove affliction is not promised, yet the probability of it should encourage us to repent.
Commentary on Joel 2:15-27
(Read Joel 2:15-27)
The priests and rulers are to appoint a solemn fast. The sinner's supplication is, Spare us, good Lord. God is ready to succour his people; and he waits to be gracious. They prayed that God would spare them, and he answered them. His promises are real answers to the prayers of faith; with him saying and doing are not two things. Some understand these promises figuratively, as pointing to gospel grace, and as fulfilled in the abundant comforts treasured up for believers in the covenant of grace.