Devoted to the Apostolic Gospel (Acts 2:37-47)
Introduction
There is a question that lurks underneath in the book of Acts. What happens when Christ is gone? Does he still work on His people, or are we abandoned in this world by a frustrated redeemer?
Luke’s Gospel lays out the ministry of Christ on this earth. Acts lays out the ministry of Christ after his ascension into heaven. The Spirit has been given to the church, but how do we know that the Spirit really ties us to Christ and works out our redemption in Christ?
Their Reaction
The crowd's anguish is not performance. These are people who, not long ago, stood in Pilate's courtroom and chanted to crucify Christ. Peter does not let them appeal to peer pressure. They cannot defend themselves by saying they were victims of mob mentality.
He addresses them as a group and individually: you all did this. Peter understands this kind of guilt personally. He is the man who looked at Christ when he denied Christ the third time. Peter also knows the awkward breakfast where Christ asks Peter three times if Peter loves him. Peter is not rebuked, but commissioned to care for Christ’s people.
And that is precisely why Peter is the right man to preach this sermon.
The crowd is cut to the heart. This is a stabbing pain. This leads them to ask the question: What shall we do? This is a vulnerable question. On one side, it reflects genuine contrition where they want to make this right. On the other hand, it carries a dangerous temptation: the hope that maybe they can balance the ledger themselves. The reality is, there is no way for them to undo their sin in their own strength.
Peter's Solution
Peter does not cite Deuteronomy 19 to condemn them. This is a real option. Moses prescribed that false witnesses receive the very punishment they sought for another. These people falsely accused Christ and handed him over to death. They bore false testimony against Christ. Peter could have called for a mass crucifixion. This would be the legal way to make it right. They wanted Christ to die on a cross, and so they could die on the cross.
Instead: “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit.”
Repentance here is not simply a change of opinion. It is a reorientation of the whole self. It is adjusting convictions to align with the Lord’s purpose.
And notice the scope of the promise Peter gives them: "The promise is for you and for your children and for all who are far off." Peter is making a deliberate echo of Genesis 17:7, of the covenant God made with Abraham and his household.
The community is set apart by the Spirit, and we would expect the Spirit to be present in the covenant community. The church is a covenant people, structured like a family, with children included in its promises. This is how it has always been since the Lord gave his first promise in Genesis 3:15. Baptism does not save, but it is the designation of a community set apart in Christ. Baptism is the sign of the people who have passed through the sea or the flood. It is the sign that the Spirit dwells in the midst of God’s covenant community.
The Church Continuing
Luke tells us that three thousand are added to the fellowship of believers. This is amazing that this one sermon leads to such a commitment. We learn how this community functions: they devote themselves to the apostles' teaching, to fellowship, to the breaking of bread, and to prayer.
The word devoted implies a continual commitment to the Apostles’ teaching. They are going to learn more and more about the implications of the Gospel. They hear the Gospel, but they do not definitively know the Gospel. The Gospel is not a one-and-done message. We might be able to say it, but living it out is the Christian struggle.
They also devote themselves to the fellowship of believers. The church family is not just casual fellowship. The community is members like two people in a business venture (Luke 5:10). This means bearing one another's burdens, contributing when others have a need, and a true commitment to one another. One is not on the outside looking in.
The breaking of bread is communion of the saints. This would include the sacrament of communion, but also the sharing in the fellowship with one another. They share the common commitment to the devotion to the apostles’ teaching.
The fellowship also continues to pray for one another. This is how the community bears with each other. The community is committed to seeing their fellow sojourner arrive complete in the goal of heaven.
Conclusion
Peter preaches a sermon that cuts these people to the heart. Peter is a hypocrite who denied Christ three times. However, the Lord still uses him. It is not because Peter is so eloquent, but because the Spirit works through the gospel. The Spirit comes to dwell within his people. We know that Christ has not left us, and he continues to work on us. We raise our families in the Lord. We sit under apostolic preaching that we will never exhaust. We bear one another's burdens. We pray. And we know that the gates of hell will not prevail against the church because the Lord who adds to his church is the Lord who has already overcome.
Let us be a people devoted to the apostolic teaching.