The Spirit poured out at Pentecost
At Pentecost, Peter said that the outpouring of the Holy Spirit was what Joel had spoken, then quoted Joel's promise that God would pour out His Spirit on all people.
Then Peter stood up with the Eleven, lifted up his voice, and addressed the crowd: “Men of Judea and all who dwell in Jerusalem, let this be known to you, and listen carefully to my words. These men are not drunk, as you suppose. It is only the third hour of the day! No, this is what was spoken by the prophet Joel:
Joel 2:28-32 promises the outpouring of God's Spirit; Acts 2:16-21 introduces the same words by naming the prophet Joel and quotes the passage.