I will pour out of My Spirit

In the last days, I will pour out of My Spirit on all flesh

I will pour out My Spirit
Acts 2:10-15 Proselyte

Acts 2:16-21 I will pour out of My Spirit

Acts 2:22-30 Miracles of Jesus
ACTS 2:16-18  16 But this is what was spoken by the prophet Joel: 17 ‘And it shall come to pass in the last days, says God, that I will pour out of My Spirit on all flesh; your sons and your daughters shall prophesy, your young men shall see visions, your old men shall dream dreams. 18 And on My menservants and on My maidservants I will pour out of My Spirit in those days; and they shall prophesy.

Why does Peter cite what the prophet Joel said as recorded in Joel 2?
To say that what they were witnessing wasn't drunkenness but the fulfillment of Joel's prophecy; now that the "last days" or the final phase of God's plan for mankind - i.e., the soul harvest - had begun with the death, resurrection and ascension of Jesus, God was pouring out through His Holy Spirit not just on kings and prophets but "on all flesh," including "sons... daughters... young men... old men... menservants and on maidservants" (Acts 2:17,18).

ACTS 2:19-21  19 ‘I will show wonders in heaven above and signs in the earth beneath: blood and fire and vapor of smoke. 20 The sun shall be turned into darkness, and the moon into blood, before the coming of the great and awesome day of the Lord. 21 And it shall come to pass that whoever calls on the name of the Lord shall be saved.’

What are the "wonders" (Acts 2:19)?
The things to happen "before the coming of the great and awesome day of the Lord" (Acts 2:20) - i.e., the second coming of Jesus.

What does science call the "sun" turning "into darkness" (Acts 2:20)?
A solar eclipse, during which the sun, moon and earth become aligned, with the moon in the middle and blocking people on the earth from seeing the sun.

What does science call the "moon" turning "into blood" (Acts 2:20)?
A lunar eclipse of a full moon, during which the sun, earth and moon become aligned, with the earth in the middle. The light from the sun glances off the outer edge of the earth, where sunrises and sunsets are taking place, disperses and casts a reddish glow (the type you see at sunsets) on the surface of the moon (as science advances, more of the Bible continue to be explained). Solar and lunar eclipses, as well as "signs in the earth," including "fire and vapor of smoke" (Acts 2:19) will precede Jesus' second coming.

Will that be cause for fear?
Not for those who call "on the name" of Jesus, their "Lord" (Acts 2:21)