Acts 2:20 in the King James Version
The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
Context
19 I will show wonders in the sky above, and signs on the earth beneath: blood, and fire, and billows of smoke.
20 The sun will be turned into darkness, and the moon into blood, before the great and glorious day of the Lord comes.
21 It will be that whoever will call on the name of the Lord will be saved.’