Joel 2:31
The sun will be turned into darkness, and the moon into blood, before the great and terrible day of the LORD comes.
World English Bible (Public Domain)
In context
Before · Joel 2:29–30
29And also on the servants and on the handmaids in those days, I will pour out my Spirit. 30I will show wonders in the heavens and on the earth: blood, fire, and pillars of smoke.
31The sun will be turned into darkness, and the moon into blood, before the great and terrible day of the LORD comes.
After · Joel 2:32
32It will happen that whoever will call on the LORD’s name shall be saved; for in Mount Zion and in Jerusalem there will be those who escape, as the LORD has said, and among the remnant, those whom the LORD calls.