Joel 2:2-3

2A day of darkness and gloom, A day of clouds and of thick [dark] mist, Like the dawn spread over the mountains; There is a [pagan, hostile] people numerous and mighty, The like of which has never been before Nor will be again afterward Even for years of many generations.

3Before them a fire devours, And behind them a flame burns; Before them the land is like the Garden of Eden, But behind them a desolate wilderness; And nothing at all escapes them.