The Bible Says Commentary on the Book of Joel
Joel 2 begins with a summons to blow the trumpet as a warning concerning an invading army that the LORD will use to judge the people of Judah. The army will be mighty, and cover the land of Judah like a locust plague. In view of the imminent approach of such a great army, Joel calls all the inhabitants of Judah to repent. Once the people genuinely repent, the LORD will send them prosperity in the form of bountiful crops. He will destroy the invading army and restore to the nation of Judah all that she lost. It seems the people did repent, and the judgement was delayed. The chapter concludes with God’s promise to pour out His Spirit on all flesh in the end times.