Joel 2:2, 31

A day of darkness and gloom, A day of clouds and of thick [dark] mist, Like the dawn spread over the mountains; There is a [pagan, hostile] people numerous and mighty, The like of which has never been before Nor will be again afterward Even for years of many generations.

“The sun will be turned into darkness And the moon into blood Before the great and terrible day of the LORD comes. [Is 13:6, 9-11; 24:21-23; Ezek 32:7-10; Matt 24:29, 30; Rev 6:12-17]