Joel 2:1-2

Blow ye 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 nigh at hand; 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.