31 The sun will be turned to darkness and the moon to blood before the coming of the great and dreadful day of the LORD.

Read Joel 2:31 Using Other Translations

The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come.
The sun shall be turned to darkness, and the moon to blood, before the great and awesome day of the LORD comes.
The sun will become dark, and the moon will turn blood red before that great and terrible day of the LORD arrives.