Joel 2:2-3

2a day of darkness and gloom, a day of clouds and gross darkness, as the dawn spread upon the mountains; — a great people and a strong; there hath not been ever the like, neither shall be any more after them, to the years of generations and generations.

3A fire devoureth before them, and behind them a flame burneth; the land is as a garden of Eden before them, and behind them a desolate wilderness: yea, and nothing escapeth them.