Pentecost and the Outpoured Spirit — Acts 2

Acts 2:16-21 interprets Pentecost as the fulfillment of Joel: "I will pour out my Spirit on all flesh." The ascended Christ sends the Spirit, and the last days begin with the birth of the church.

Augustine — On the Trinity, and John Calvin — Institutes of the Christian Religion. The Spirit given here is the same who proceeds in John 15.

Pentecost fulfills the promise of the Spirit in John 15:26 and the new heart of Ezek 36:27. It constitutes the one body of 1Cor 12:13 and looks ahead to the consummation of Rev 21:3.