Acts 2:20

20 The sun will be turned to darkness and the moon to blood before the coming of the great and glorious day of the Lord.

Read Acts 2:20 Using Other Translations

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

What does Acts 2:20 mean?

John Gill's Exposition of the Bible
Acts 2:20

The sun shall be turned into darkness
As at the death of Christ, by a total eclipse of it:

and the moon into blood;
as at the opening of the sixth seal, ( Revelation 6:12 )

before that great and notable day of the Lord come;
when he shall come in power and great glory, as he did in a few years after this, to take vengeance on the Jews, and destroy their nation, city, and temple; in which there was a display of his greatness, and power, and which was awful and "terrible" to them, as in Joel it is called; (See Gill on Matthew 24:29).

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