The Book of Joel starts with saying that the Word of the LORD came to Joel who was the son of Pethuel. The LORD told Joel that a lot of locusts were going to destroy all of Israel's crops, which was their main source of food. He calls the elders and all the people to fast. God wants them to not rend their clothes, but their hearts. In the end, though, he speaks of future blessings to those who trust in Yahweh.