Joel 2:2-3

2It will be a day of dreadful darkness, a day of foreboding storm clouds, like blackness spread over the mountains. It is a huge and powerful army – there has never been anything like it ever before, and there will not be anything like it for many generations to come!

3Like fire they devour everything in their path; a flame blazes behind them. The land looks like the Garden of Eden before them, but behind them there is only a desolate wilderness – for nothing escapes them!