The chapter opens with a trumpet in Zion: the day of the Lord is coming, a day of darkness and clouds. A vast and mighty army advances like fire, with a flourishing land before it and a desert behind. It runs like horses and warriors, scales walls and nothing stops it. The earth and heavens tremble before it, and the Lord himself leads his army. The day is great and terrible, and no one can endure it.
Yet there is still a call. Even now, says the Lord, return to me with all your heart, with fasting, weeping and mourning, and tear your hearts, not your garments. Joel recalls what God is like: gracious, compassionate, slow to anger and rich in steadfast love, and he may relent from sending disaster. The trumpet is to sound, a sacred assembly is to be called, elders, children and newlyweds are to gather, and the priests are to weep between the porch and the altar and ask the Lord not to make his heritage a disgrace.
The Lord shows himself jealous for his land and moved with pity for his people. He promises to send grain, wine and oil, to drive away the northern army and to do great things. He tells the soil, the animals and Zion not to fear but to rejoice: the rain will come, the threshing floors will fill, and he will repay the years the locust has eaten. The people will eat until they are satisfied, praise the Lord, and never again be put to shame.
Afterward, the Lord says, he will pour out his Spirit on all flesh: sons and daughters will prophesy, old men will dream dreams and young men will see visions, and the Spirit will fall on servants, men and women. There will be signs in the heavens and on the earth, with blood, fire and columns of smoke; the sun will turn to darkness and the moon to blood before the great and terrible day. And everyone who calls on the name of the Lord will be saved, because on Mount Zion and in Jerusalem there will be deliverance.