Adam Clarke's Commentary on the Bible - Acts 2:21
Whosoever shall call on the name of the Lord shall be saved - The predicted ruin is now impending; and only such as receive the Gospel of the Son of God shall be saved. And that none but the Christians did escape, when God poured out these judgments, is well known; and that All the Christians did escape, not one of them perishing in these devastations, stands attested by the most respectable authority. See the note on Matthew 24:13 . read more
Adam Clarke's Commentary on the Bible - Acts 2:20
The sun shall be turned into darkness, and the moon into blood - These are figurative representations of eclipses, intended most probably to point out the fall of the civil and ecclesiastical state in Judea: see the notes on Matthew 24:29 . That the Sun is darkened when a total eclipse takes place, and that the Moon appears of a bloody hue in such circumstances, every person knows. read more