Joel 2:1-3

Blow the trumpet in Jerusalem; shout a warning on my holy mountain. Let all the people who live in the land shake with fear, because the LORD’s day of judging is coming; it is near. It will be a dark, gloomy day, cloudy and black. Like the light at sunrise, a great and powerful army will spread over the mountains. There has never been anything like it before, and there will never be anything like it again. In front of them a fire destroys; in back of them a flame burns. The land in front of them is like the garden of Eden; the land behind them is like an empty desert. Nothing will escape from them.