Acts 2:16-21 But what you see happening is simply the fulfillment of what was predicted by the prophet Joel : ff,

AUV⁽ⁱ⁾ ¹⁶ But what you see happening is simply [the fulfillment of] what was predicted by the prophet Joel [2:28ff], ¹⁷ God said that ‘in the last days [of the Jewish nation?] I will pour out My Holy Spirit upon all people [i.e., both Jews and Gentiles], and your sons and daughters will speak out [in prophecies] and your young men will see [supernatural] visions, and your old men will have [supernatural] dreams. ¹⁸ Yes, and I will pour out my Holy Spirit on my male and female [spiritual] slaves in those days so that they will speak out in prophecies. ¹⁹ And I will display miracles in the sky above and [supernatural] signs on the earth below [consisting of] blood, fire and smoky vapor. ²⁰ [In that day] the sun will become dark and the moon will [appear] as blood. [This will all happen] before the great and wonderful day when the Lord comes. [Note: Some view these last two verses as a reference to events occurring at the end of time. See Matt. 24:29-30]. ²¹ And the time will come when every person who calls on the name of the Lord will be saved' [i.e., whoever appeals to God through obedient faith in Christ].