Joel 2:1-2

Blow the horn in Zion; give a shout on my holy mountain! Let all the people of the land tremble, for the day of the LORD is coming. It is near— a day of darkness and no light, a day of clouds and thick darkness! Like blackness spread out upon the mountains, a great and powerful army comes, unlike any that has ever come before them, or will come after them in centuries ahead.