At Pentecost, the exalted Jesus publicly poured out the Holy Spirit. This showed that the Jesus who was crucified has been raised, exalted to God’s right hand, and is both Lord and Messiah. Therefore Peter called the people to repent, be baptized in His name, and receive forgiveness and the Holy Spirit.

Luke begins by saying that the day of Pentecost had arrived and the disciples were all together in one place. This is not presented as a private spiritual experience, but as a major event in God’s redemptive plan. What happened came suddenly from heaven. Luke describes a sound like a violent wind and something like tongues of fire. He does not say there was literal wind in the room or literal flames on their heads. Rather, he carefully describes audible and visible signs showing that God Himself was acting.

Then all of them were filled with the Holy Spirit and began to speak in other languages as the Spirit enabled them. In this passage, the emphasis is on real, recognizable languages. The crowd repeatedly says that each person hears the disciples speaking in his own native language. They were declaring the mighty deeds of God. So the point is not unclear ecstatic speech, but a public miracle through which many kinds of people heard God’s works in languages they understood.

The makeup of the crowd is important. These were devout Jews and proselytes from many nations who were staying in Jerusalem for the feast. That is why Peter addresses them as “men of Judea,” “men of Israel,” and “all the house of Israel.” This is a covenantal moment within Israel’s story, though the wording of the promise will later reach beyond this immediate Jewish setting.

The crowd responds in different ways. Some are amazed and ask what the event means. Others mock and claim the disciples are drunk. Peter immediately rejects that explanation. It is only nine in the morning. He then explains the event from Scripture. In effect, he is saying not merely, “this reminds us of Joel,” but, “this is what Joel spoke about.” Pentecost is the beginning of the promised last-days outpouring of the Spirit.

By quoting Joel, Peter shows that the age of fulfillment has begun. God is now pouring out His Spirit broadly—on sons and daughters, young and old, male and female servants. The gift is not limited to a narrow group. At the same time, Joel’s prophecy also includes signs connected to the coming day of the Lord. So Pentecost begins this fulfillment, but it does not exhaust every part of Joel’s prophecy in that one moment. The last days have begun, while the full day-of-the-Lord horizon still lies ahead.

Joel’s prophecy also contains a great promise: everyone who calls on the name of the Lord will be saved. Peter then shows that this saving promise now centers on Jesus by preaching His death, resurrection, exaltation, and lordship.

Peter reminds the crowd that Jesus the Nazarene was publicly approved by God through mighty works, wonders, and signs performed among them. Jesus’ ministry was not hidden. They knew what He had done. Yet Peter also says that Jesus was handed over according to God’s predetermined plan and foreknowledge. His death was not an accident, nor was it outside God’s control. At the same time, Peter does not use God’s sovereignty to excuse human sin. He says plainly, “you executed” Him by the hands of lawless men. God’s sovereign purpose and human guilt are both true.

But death did not prevail. God raised Jesus up, because it was impossible for death to hold Him. Peter supports this claim from Psalm 16. He does not leave the resurrection as a bare assertion; he argues for it from Scripture.

His reasoning about David is crucial. David spoke of one who would not be abandoned to Hades and whose body would not see decay. But David himself died, was buried, and his tomb was still there in Jerusalem. So Psalm 16 cannot be fully about David. David was a prophet, and he knew that God had sworn an oath to place one of his descendants on his throne. Therefore he was speaking beforehand about the resurrection of the Messiah. The psalm fits Christ, not David, because Jesus truly was not abandoned to the realm of the dead, and His body did not decay.

Peter then adds apostolic testimony to biblical proof: “This Jesus God raised up, and we are all witnesses of it.” The claim rests on both Scripture and eyewitness testimony.

Next Peter explains the meaning of Pentecost itself. Jesus has been exalted to the right hand of God. Having received from the Father the promised Holy Spirit, He has poured out what the crowd now sees and hears. Pentecost, then, is not merely an event about the Spirit in isolation. It is public evidence that Jesus is enthroned in heaven and that He is the one who has sent the Spirit.

Peter then quotes Psalm 110: “The Lord said to my Lord, ‘Sit at my right hand until I make your enemies a footstool for your feet.’” David did not ascend into heaven in this way, so once again the words point beyond David to the Messiah. Peter’s conclusion is the sermon’s public verdict, drawn from resurrection, exaltation, and Scripture: God has made this Jesus, whom they crucified, both Lord and Christ. “Christ” means Messiah, the promised anointed King. “Lord” here is not merely a title of respect. In the flow of Peter’s sermon, it is bound up with Jesus’ exaltation to God’s right hand and with the saving promise now fulfilled in Him.

When the people hear this, they are cut to the heart. Their consciences are pierced. They understand their guilt before God and ask, “What should we do?” Peter’s answer is direct and concrete: “Repent, and each one of you be baptized in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.”

Repentance is a real turning of mind and heart from sin and unbelief to God. Baptism in Jesus’ name is the public expression of faith and allegiance to Him. In this verse, repentance and baptism belong together as the proper response to the risen Lord. Baptism is not presented as a magical act, and this verse should not be turned into a mechanical ritual that saves apart from repentance and faith. But neither is baptism treated as an optional extra with no real place in conversion. Peter gives one united summons to a guilty people: turn to Jesus openly and submit to Him.

The promise attached to this response is forgiveness of sins and the gift of the Holy Spirit. Peter adds that this promise is for them, for their children, and for all who are far away—as many as the Lord our God will call. In the immediate setting, this certainly includes Jews scattered across many lands. But the wording is not so narrow that it stops there. Acts will show that God’s call extends outward more widely, including Gentiles. Even so, the emphasis remains that salvation comes to those whom the Lord calls and who respond to that call.

Peter continues to urge them, “Save yourselves from this perverse generation.” He is not teaching self-salvation by human effort. He is calling them to separate from the rebellious generation that rejected Jesus and to take God’s appointed way of escape. This is not merely a private inward decision. It is a public break with a judged community and a public identification with the Messiah and His people.

Those who accepted Peter’s message were baptized, and about three thousand were added that day. The sermon accomplished its purpose. The Spirit’s coming led to the public exaltation of Jesus, the conviction of sinners, and the gathering of a new community centered on the risen Lord.

At the same time, Pentecost includes foundational salvation-historical features, so it should not be turned into a wooden required sequence for every later believer’s experience.

Key Truths: - Pentecost is a public act of God that marks the beginning of the promised last-days outpouring of the Spirit. - The languages in Acts 2 are best understood as real human languages recognized by the crowd. - The disciples were declaring the mighty deeds of God. - The Spirit’s coming points to Jesus; it shows that the crucified Jesus has been raised and exalted. - God sovereignly planned Jesus’ death, yet those who crucified Him remain truly guilty. - Psalm 16 speaks ultimately of the Messiah’s resurrection, not of David himself. - Psalm 110 supports Jesus’ exaltation to God’s right hand and His present lordship. - Peter’s conclusion is clear: Jesus is both Lord and Messiah. - The right response is repentance and baptism in Jesus’ name, with the promise of forgiveness and the Holy Spirit. - The promise extends beyond the immediate crowd to all whom the Lord calls.