After promising the Holy Spirit, Jesus now sends Him to fill His church, enabling them to tell of his mighty works, calling all to repentance for the forgiveness of sins.

Resources:

Acts 2:1-41

Acts: Baker Exegetical Commentary on the New Testament, Darrel Bock

Acts (The NIV Application Commentary)Ajith Fernando

Acts 1-12 For You: Charting the Birth of the Church, Al Mohler

Exalting Jesus in Acts, Tony Merida