Revelation 6:12

And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;
All Commentaries on Revelation 6:12 Go To Revelation 6

Victorinus of Pettau

AD 303
The sun becomes as sackcloth; that is, the brightness of doctrine will be obscured by unbelievers.
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Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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