Acts 2:14-21

Verse 14

Peter, standing up with the eleven - They probably spoke by turns, not altogether; but Peter began the discourse.

All ye that dwell at Jerusalem - Οἱ κατοικουντες would be better translated by the word sojourn, because these were not inhabitants of Judea, but the strangers mentioned in Act 2:9-11, who had come up to the feast.
Verse 15

But the third hour of the day - That is, about nine o'clock in the morning, previously to which the Jews scarcely ever ate or drank, for that hour was the hour of prayer. This custom appears to have been so common that even the most intemperate among the Jews were not known to transgress it; Peter therefore spoke with confidence when he said, these are not drunken - seeing it is but the third hour of the day, previously to which even the intemperate did not use wine.
Verse 16

Spoken by the prophet Joel - The prophecy which he delivered so long ago is just now fulfilled; and this is another proof that Jesus whom ye have crucified is the Messiah.
Verse 17

In the last days - The time of the Messiah; and so the phrase was understood among the Jews.

I will pour out of my Spirit upon all flesh - Rabbi Tanchum says, "When Moses laid his hands upon Joshua, the holy blessed God said, In the time of the old text, each individual prophet prophesied; but, in the times of the Messiah, all the Israelites shall be prophets." And this they build on the prophecy quoted in this place by Peter.

Your sons and your daughters shall prophesy - The word prophesy is not to be understood here as implying the knowledge and discovery of future events; but signifies to teach and proclaim the great truths of God, especially those which concerned redemption by Jesus Christ.

Your young men shall see visions, etc. - These were two of the various ways in which God revealed himself under the Old Testament. Sometimes he revealed himself by a symbol, which was a sufficient proof of the Divine presence: fire was the most ordinary, as it was the most expressive, symbol. Thus he appeared to Moses on Mount Horeb, and afterwards at Sinai; to Abraham, Genesis 15:1-21; to Elijah, 1Kgs 19:11, 1Kgs 19:12. At other times he revealed himself by angelic ministry: this was frequent, especially in the days of the patriarchs, of which we find many instances in the book of Genesis.

By dreams he discovered his will in numerous instances: see the remarkable case of Joseph, Gen 37:5, Gen 37:9; of Jacob, Gen 28:1, etc.; Gen 46:2, etc.; of Pharaoh, Gen 41:1-7; of Nebuchadnezzar, Dan 4:10-17. For the different ways in which God communicated the knowledge of his will to mankind, see the note on Gen 15:1.
Verse 18

On my servants and on my handmaidens - This properly means persons of the lowest condition, such as male and female slaves. As the Jews asserted that the spirit of prophecy never rested upon a poor man, these words are quoted to show that, under the Gospel dispensation, neither bond nor free, male nor female, is excluded from sharing in the gifts and graces of the Divine Spirit.
Verse 19

I will show wonders - It is likely that both the prophet and the apostle refer to the calamities that fell upon the Jews at the destruction of Jerusalem, and the fearful signs and portents that preceded those calamities. See the notes on Mat 24:5-7 (note), where these are distinctly related.

Blood, fire, and vapour of smoke - Skirmishes and assassinations over the land, and wasting the country with fire and sword.
Verse 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 Mat 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.
Verse 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 Mat 24:13.
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