Acts 2:20
"The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:"Acts 2:20 (KJV)
Context from Acts 2
18
And on my servants and on my handmaidens I will pour out in those days of my Spirit; and they shall prophesy:
19
And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke:
20
The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
21
And it shall come to pass, that whosoever shall call on the name of the Lord shall be saved.
22
Ye men of Israel, hear these words; Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by him in the midst of you, as ye yourselves also know: