14 But Peter, standing with the eleven, raised his voice and addressed them, . . .
36 Therefore let the entire house of Israel know with certainty that God has made him both Lord and Messiah, this Jesus whom you crucified.”
37 Now when they heard this, they were cut to the heart and said to Peter and to the other apostles, “Brothers, what should we do?” 38 Peter said to them, “Repent, and be baptized every one of you in the name of Jesus Christ so that your sins may be forgiven; and you will receive the gift of the Holy Spirit. 39 For the promise is for you, for your children, and for all who are far away, everyone whom the Lord our God calls to him.” 40 And he testified with many other arguments and exhorted them, saying, “Save yourselves from this corrupt generation.” 41 So those who welcomed his message were baptized, and that day about three thousand persons were added.
On the Day of Pentecost, the Holy Spirit fell upon the church and created quite a stir, which gave Peter, standing with the eleven other Apostles, the opportunity to proclaim the gospel of Jesus to the gathered crowd. Peter tells them that God has “made him both Lord and Messiah, this Jesus whom you crucified.” That is, God has vindicated the one God sent into the world, but which the world rejected. Having finished the sermon, it’s clear that the message has touched a chord, and the people who heard the message have a question for Peter and his companions: “what should we do?” What’s next?