Joel 2:2-13

a day of darkness and gloominess, a day of clouds and thick 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, even to the years of many generations. A fire devoureth before them; and behind them a flame burneth: the land is as the garden of Eden before them, and behind them a desolate wilderness; yea, and none hath escaped them. The appearance of them is as the appearance of horses; and as horsemen, so do they run. Like the noise of chariots on the tops of the mountains do they leap, like the noise of a flame of fire that devoureth the stubble, as a strong people set in battle array. At their presence the peoples are in anguish; all faces are waxed pale. They run like mighty men; they climb the wall like men of war; and they march every one on his ways, and they break not their ranks. Neither doth one thrust another; they march every one in his path; and they burst through the weapons, and break not off their course. They leap upon the city; they run upon the wall; they climb up into the houses; they enter in at the windows like a thief. The earth quaketh before them; the heavens tremble; the sun and the moon are darkened, and the stars withdraw their shining. And Jehovah uttereth his voice before his army; for his camp is very great; for he is strong that executeth his word; for the day of Jehovah is great and very terrible; and who can abide it? Yet even now, saith Jehovah, turn ye unto me with all your heart, and with fasting, and with weeping, and with mourning: and rend your heart, and not your garments, and turn unto Jehovah your God; for he is gracious and merciful, slow to anger, and abundant in lovingkindness, and repenteth him of the evil.