“This Is That": How Peter Explained Pentecost
Imagine the scene: a loud, sudden wind fills a room in Jerusalem during one of the busiest festival weeks of the year. Tongues of fire appear over the heads of a group of believers. They begin speaking in languages they've never learned, clearly and intelligibly. A crowd gathers from every direction, confused and amazed, murmuring theories about what's happening and whether these people have simply had too much wine. In the middle of the chaos, one fisherman-turned-apostle stands up and says, "Let me explain this to you and listen carefully to what I say" (Acts 2:14).
Peter didn't hedge his explanation. His expository sermon on the morning’s events spoke directly to their meaning. He had clarity about what was happening, why it was happening, and how it fulfilled prophecy that was hundreds of years old. What a remarkable transformation for a man who, weeks earlier, had denied even knowing Jesus.
Why the Prophet Joel
The Old Testament offered Peter several passages that he could have drawn from about a coming outpouring of God's Spirit such as Isaiah 44:3, Ezekiel 36:26–27, Ezekiel 37's vision of dry bones, or Zechariah 12. All of those passages talk about outpouring that will happen to Israel and its future restoration. So why does Peter reach for Joel 2:28 instead of any of these other national-restoration texts?
“‘And it shall be in the last days’, God says, ‘that I will pour out My Spirit on all humanity; and your sons and your daughters shall prophesy...’” (Acts 2:17–18, quoting Joel 2:28).
Three things make Joel the right text for this moment. First, it uniquely combines universality (“all humanity”) with a covenant shift. Peter changes Joel's original afterward to in the last days, as a form of commentary that signaled this moment as a decisive turning point in redemptive history. The idea of the last days for Israel was connected to the appearance of the Messiah and wasn’t an incidental addendum tacked onto the passage or a misquote. Second, Joel's themes of God's mercy, God's judgment, and the outpouring of the Spirit all align with what Peter wants this crowd to understand about the moment they're witnessing. Third, Joel functions as a representative book within the prophetic tradition. In its brief three chapters, there are echoes of at least thirteen other books in the Hebrew Bible, including nine prophetic books. Quoting Joel is a short-hand way of acknowledging all the prophetic tradition of Israel, lending weight to Peter’s words. This probably was grasped by the crowd in the temple and would have carried meaning with them.
Tongues as Prophecy
It's easy to read this moment through a modern lens and assume the gift of tongues of Pentecost were private, ecstatic, unintelligible speech. But look closely at what actually happened: people from more than a dozen different regions around the Mediterranean heard their own native languages being spoken clearly, and understood exactly what was being said. This was intelligible, Spirit-inspired communication. Peter doesn't describe the event using the language we normally associate with tongues in his explanation. He refers to it using the language of the prophet Joel, calling it prophesying. This doesn’t demean or marginalize tongues, but it reveals the way Peter interpreted the moment.
That single observation reframes the whole event. The point of Pentecost was that God's voice was now speaking through ordinary, unschooled people, clearly, in a way that could be understood by anyone listening. God’s inspired speech was given to all the believers present and then spoken from each of those people to encourage others.
A New Meaning for an Old Festival
Pentecost, or the Jewish Festival of Weeks (Shavuot), already carried meaning for the Jewish crowd gathered that day. It was traditionally the date God gave Israel the covenant of the Law at Sinai, fifty days after the Exodus. The moment takes that existing association and fills it with new meaning. The festival connected with God's presence descending on a mountain, mediated through Moses to a nation, becomes the moment the Spirit is poured out directly on all believers.
God no longer spoke to only a select few people. The Spirit now spoke to, and through, every person who believed; the fishermen, women, servants, the old and the young alike. That shift, from occasional and mediated to direct and universal communication, is a key point of Peter's sermon explaining the moment. The Spirit now speaks through all believers and remains the reality we can live into today.
What This Means for How We Hear God
If Pentecost really was the moment God democratized direct communication, then the discomfort many of us feel about “not being spiritual enough” to hear God doesn't come from Scripture. It comes from somewhere else. Peter's own explanation, given to a confused and skeptical crowd two thousand years ago, was that this gift belongs to "all people”, sons and daughters, young and old, in every station of life, without exception.
That includes us. The wind and fire were dramatic, but the underlying message was simple and enduring: God now speaks directly to and through ordinary believers like us, not because we are exceptional, but because the Spirit has made a permanent home within us.
A Crowd That Needed an Explanation
It's worth pausing on just how confused that Pentecost crowd actually was before Peter spoke. Acts 2 tells us they were “amazed and perplexed”, and some in the crowd mocked what they were seeing, assuming the disciples were simply drunk. That reaction matters, because it tells us something genuine and unusual was visibly happening. It was something dramatic enough to draw a bewildered crowd and provoke real debate about how to explain it, not a quiet, private experience easily rationalized away. Peter's sermon wasn't a theological lecture delivered to an already-convinced audience. It was a bold, public explanation offered to skeptics and mockers standing right in front of him, in the middle of a busy festival.
Why Peter Could Speak with Confidence
Remember who is standing up to give this explanation. This is the same Peter who, weeks earlier, denied even knowing Jesus three times in a single night, out of fear for his own safety. Something had clearly changed in him, and Acts 2 tells us plainly what it was: he was “filled with the Holy Spirit” (Acts 2:4). Peter's transformation from a fearful denier to a bold public preacher is itself a living illustration of exactly what he's described in his sermon. He pointed out that ordinary people, filled with the Spirit, can speak with clarity and courage that has nothing to do with their own natural qualifications.
We can share this same confidence that the Spirit also can speak in our lives. We don’t need to have a perfect past because even in the midst of our brokenness and failures, God pursues us to speak in us and through us. Many of us can relate to the disappointments that were part of Peter’s story. The beautiful thing is that even in light of our difficulties, we are invited into conversation through the Spirit that is always present.
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