Joel 2:31
The sun will be turned to darkness
What it says
The sun will turn to darkness and the moon to blood before the great and terrible day of the LORD comes.
What it is doing
This verse keeps the eschatological seriousness of the coming day fully in view.
In context
28And afterward, I will pour out My Spirit on all people. 29Even on My menservants and maidservants, 30I will show wonders in the heavens and on the earth, 31The sun will be turned to darkness 32And everyone who calls on the name of the LORD