Joel 2:1-2

1Blow the trumpet in Zion, and sound an alarm in my holy mountain; let all the inhabitants of the land tremble: for the day of Jehovah cometh, for it is at hand;

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.