Peter's "Repent and Be Baptized" and the Later Revelation of Salvation by Grace

Peter in Acts 2--3 was not preaching incorrectly or with a deficient grasp of what had been revealed at that time. He was preaching exactly the message that had been given to him and to Israel up to that point. The later Pauline explanation of salvation by grace through faith without works had not yet been revealed as a distinct dispensation.

subsection*1. The Content of Peter's Message

In Acts 2:38 Peter declares:

"Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins..."

This is fully consistent with:

• The preaching of John the Baptist: a call to repentance and baptism in view of the coming kingdom.
• The preaching of Jesus in His earthly ministry, where He calls Israel to repentance and speaks of obedience, discipleship, and readiness for the kingdom.
• The kingdom message of Mark 16, which ties belief and baptism together.

If you trace cross‑references from Acts 2:38 using a resource like the Treasury of Scripture Knowledge, you will find that prior to Paul's distinct ministry, the call to "repent and be baptized" is the standard proclamation for Israel in light of the offered kingdom.

Even when Jesus answers the rich young ruler's question about inheriting eternal life, He directs him to the commandments and to radical discipleship, not to a Pauline formulation such as "believe on the Lord Jesus Christ, and thou shalt be saved." Peter is operating within that same kingdom framework.

subsection*2. The Timing of Paul's Revelation

The events of Acts 2--3 occur at or around the day of Pentecost, not long after the resurrection. Paul is not yet on the scene as an apostle of Christ; at that time he is an opponent of the Jesus movement.

Paul's conversion on the road to Damascus in Acts 9 is several years later. Even then, the full scope of the mystery was not yet articulated publicly. It is only by the time of Acts 13 and beyond, as Paul goes out on Gentile mission and as the controversy over circumcision and the law intensifies (Acts 15; Galatians 1--2), that the new dispensation of grace apart from law is clearly brought to light.

In other words:

• At Pentecost, Peter is preaching what had been revealed: the kingdom gospel to Israel.
• A decade or more later, Paul is preaching what has now additionally been revealed: the mystery of salvation by grace through faith, apart from works of the law, extending to Jew and Gentile in one body.

subsection*3. Did Peter "Misunderstand" the Mystery?

The key mistake would be to say: "Peter had the mystery available but misunderstood it; Paul later corrected him." That would imply Peter was somehow failing to grasp what God had already made plain.

A more accurate assessment is:

• At Pentecost and in the early chapters of Acts, the mystery had not yet been revealed. It was still "hid from ages and from generations" (Colossians 1:26).
• Peter, filled with the Holy Spirit, preached accurately within the revelation available at that time.
• The content of his preaching---repentance and baptism for the remission of sins in view of the kingdom---was precisely what God had entrusted to him for Israel.

This is why Peter's message in Acts 2--3 is not to be judged by the later standard of Ephesians 2:8--9. They belong to different stages in the unfolding of God's plan.

subsection*4. The Role of the Jerusalem Council (Acts 15)

By Acts 15, Paul's ministry has created a crisis: Gentiles are coming to faith in Christ without adopting the Mosaic law. This is not a minor issue of geography; it strikes at the core of how salvation relates to Israel's law and covenant.

The Jerusalem Council in Acts 15 is convened precisely because something fundamentally new is happening, not because Paul has chosen a different field. If Paul were simply extending Peter's Pentecost message geographically, there would be no need for such a council; Jerusalem would simply say, "Good, you're taking our message farther."

Instead, the council wrestles with whether Gentile believers must be circumcised and keep the law to be saved. The conclusion recognizes a distinction between God's work through Peter among the circumcision and His work through Paul among the Gentiles. Paul's account in Galatians 1--2 reinforces this: he insists that he received his gospel by revelation, not from the Jerusalem apostles.

This shows that:

• Peter's earlier kingdom‑oriented call to Israel was correct in its own context.
• Paul's later, grace‑based teaching is a revealed mystery, not a correction of Peter's supposed misunderstanding.

subsection*5. Pre‑Pauline "Repent" Passages vs.~Pauline Grace Passages

If you categorize New Testament texts into:

• Pre‑Pauline (or non‑Pauline) kingdom‑context texts emphasizing repentance, baptism, and obedience, and
• Pauline texts emphasizing grace through faith apart from works of the law,

you will see a pattern:

• Before Paul's distinct commission, "repent" and related calls dominate the proclamation to Israel.
• In Paul's letters, the focus is on grace, faith, and the completed work of Christ, with explicit statements about the law's inability to justify.

There are a few passages that invite careful discussion because they use "repent" language in contexts that are later in time, or grace language earlier, but those can be handled in an "advanced class" setting by examining audience, context, and covenant framework. The overall trend is clear enough to support a real dispensational shift.

subsection*6. A Jewish Perspective That Sees the Difference

Interestingly, some Jewish apologists who are not Christians see this very clearly. For example, a rabbi like Tovia Singer will say, in essence:

• Jesus Himself and Peter in the early chapters of Acts remain within a recognizably Jewish framework.
• It is Paul who introduces something radically different, which, in his view, distorts the original message.

He is wrong to reject Paul's message, but he is right to see that Paul's gospel is not merely a repetition of Peter's kingdom preaching in a new location. There is a substantive difference. Where such critics err is in ignoring the fact that Peter eventually recognizes this and extends the right hand of fellowship to Paul (Galatians 2), acknowledging God's work through him.

subsection*7. The Correct Way to State the Relationship

So, to restate your question in a more precise way:

• Peter in Acts 2--3 was not failing to understand the mystery of grace; that mystery had not yet been revealed.
• He preached, under the guidance of the Holy Spirit, the kingdom message appropriate for Israel at that moment.
• Later, God revealed through Paul the mystery of the dispensation of grace, which does not rest on repentance and baptism as conditions for salvation but on faith in the finished work of Christ.

Once that revelation is given, the church of this age is to live and preach according to the Pauline pattern. But Peter's early preaching must be evaluated according to what was revealed in his day, not by retroactively imposing later revelation onto an earlier stage.

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