You Will Be My Witnesses
Forty days, one promise, and a sky full of questions
Acts of the Apostles opens exactly where the Overview module left off, with the question of certainty. Luke told Theophilus he'd investigated everything closely, so you'd know the truth of what you'd been taught. Verse 3 is where that promise gets specific: "many proofs," over the course of forty days, not one vision or one appearance you could talk yourself out of. This isn't a legend written generations later. It's an introduction to an argument: that what's said about Jesus Christ is true, and the author has spoken with people who saw it happen.
Jewish tradition held that the land and the covenant belonged to Israel and would stay that way. What the disciples were still missing is that God's plan was never actually that small. His promise to Abraham was always that "in you all the nations of the earth shall be blessed" (Genesis 12:3), and the prophets spoke for centuries about a light to the nations, not just the restoration of one. It's not that Israel forfeited anything or that the land was reassigned as a punishment. It's that the covenant God made with Israel was always meant to open out to everyone, and the resurrection is the moment it actually starts.
The disciples were expecting a hybrid solution. They knew the Pharisees and Sadducees had betrayed Jesus and that Gentiles would now be welcomed into the fold, but they wrongly assumed the kingdom would still remain centered in Israel. Jesus tells them instead that they have to leave home and spread the good news to the ends of the earth, so that all who hear it may be saved.
"Lord, will you at this time restore the kingdom to Israel?"
The modern version of that question isn't hard to find: "when is God going to come back and fix this broken world?" We believe Christ is coming back, and that he'll be the final judge. But where is he in the world today? He's within all those who are part of his Church, and he calls us to be the change that's needed. As part of the Church, we aren't called to just stay home where it's safe and comfortable, read our Bibles, and wait for salvation. We're called to be active participants, evangelizing others, continuing the same calling the apostles received: keep spreading the word to the ends of the earth so that all may be saved.
"You shall receive power when the Holy Spirit has come upon you; and you shall be my witnesses in Jerusalem and in all Judea and Samaria and to the end of the earth."
Hold onto that promise as you keep reading. It's the map for everything Acts does next, and you'll watch it unfold chapter by chapter rather than needing it explained in advance.
The instinct of the apostles was to stand in awe of what was now happening. They had seen the resurrection, witnessed with their own eyes that everything Jesus said was true, and knew they'd been chosen for this position in that small sliver of history. But the angels beside them tell them their story is only just beginning. Before, they were fishermen. Now they must become fishers of men. Their time living under the wing of Jesus is over. It's their turn to put on the armor of God and go forth, and God calls them to do it immediately, with no time to waste.
Reflection — Movement One
What's the "restore the kingdom" question you still find yourself asking God: the visible, on-your-timeline fix you're waiting for instead of the mission he's already given you?
The angels tell the disciples to stop staring at the sky and get moving. Where in your own life are you still staring up at a spiritual high instead of walking out what it changed in you?
Twelve Again
The upper room, and the number that had to be whole
Back in Jerusalem, the Eleven return to the upstairs room and devote themselves to prayer, and Mary the mother of Jesus is named among them. It's worth noting: Mary remained with the apostles, knowing the work was still unfinished.
The Bible has a distinct way of using certain numbers to symbolize something. Seven represents completeness, rest, divine fullness. Forty represents testing, trial, a generation passing before a major transition. And twelve represents God's people, complete and governed. The original twelve tribes of Israel (the sons of Jacob) set the base pattern that gets replicated in the twelve apostles. When Judas betrays Jesus, the apostles aren't complete without a twelfth, so they choose Matthias to join their order. God seemingly uses numbers throughout the Bible as a kind of signature, marking that these are his people and what's being done comes from him.
Klēros is where the word "clergy" eventually comes from: a portion assigned, not chosen by the one who receives it. Casting lots was a real, established Old Testament practice (Urim and Thummim, Proverbs 16:33: "the lot is cast into the lap, but the decision is wholly from the Lord"), used to remove human preference entirely and let God decide. This is the last time anyone in the New Testament is chosen for ministry this way. After Pentecost, the pattern shifts to the Spirit guiding through prayer and discernment instead.
Reflection — Movement Two
The Twelve had to be whole before Pentecost could happen. Is there something in your own life, a relationship, a commitment, that needs to be made whole before you can move forward into what God's asking of you?
Pentecost
What Babel scattered, the Spirit begins to gather
In Genesis 11 we read the story of the tower of Babel being built, and honestly, every time I read it, I get a kick out of it. God actually says, "Come, let us go down and there confuse their language, so that they may not understand one another's speech" (Genesis 11:7). Why did God do this? It seems like a pretty funny practical joke when you read it at face value, but the actual intent of God isn't just to confuse the people for the sake of it. He's confusing their language because the entire population of God's people had found themselves living in the same place, speaking the same language, and building a tower that would reach the heavens. God didn't want a single population to be blessed, and he certainly didn't want the greatest feat of his people to be building a very tall tower. He wanted his grace to spread to all corners of the earth, so he confused their language and scattered them.
Pentecost flips the story of Babel on its head. Instead of confusing everyone's language, God lets the crowd hear the apostles, filled with the Spirit and speaking in tongues they'd never learned, each in their own native language. What one event scattered through confusion, the other begins to bring back together through understanding. It isn't a coincidence that this happened on Pentecost either. The feast was one of three great pilgrimage feasts where Jews "from every nation under heaven" would gather. God knew this would be an opportunity to speak to all of his people who were once scattered. By this point in Jewish tradition, Pentecost had also come to be associated with Moses receiving the Law at Sinai (the Ten Commandments). Its original purpose in the Torah was actually a harvest feast, the firstfruits of the wheat, but now God makes it the day a new law is born. What was once a list of rules written on stone now becomes a commandment written on the hearts of all his people: love me and love one another in Jesus's name.
"And suddenly a sound came from heaven like the rush of a mighty wind, and it filled all the house where they were sitting. And there appeared to them tongues as of fire, distributed and resting on each one of them. And they were all filled with the Holy Spirit and began to speak in other tongues, as the Spirit gave them utterance."
Church Father
"The ungodly pride of men built a high tower against the Lord, and the human race was deservedly divided by languages, so that each nation would speak its own language and thus not be understood by the others... the scattered members of the human race, as of one body, might be attached to their one head, Christ, and so reunited, and fused together into the unity of the holy body by the fire of love."
— Augustine, Sermon 271
Not everyone is as amazed as others at this miracle of the apostles speaking so that everyone heard them in their own native language. Some mock, saying the apostles are just drunk and rambling. They refuse to acknowledge a miracle happening right before their eyes. That same skepticism can still be seen all around the world today, and it was present within the first minutes of the Church forming, right alongside those who listened, believed, and were amazed.
Reflection — Movement Three
Babel scattered people who couldn't understand each other. Where in your own relationships or community is there a "Babel," a place understanding has broken down, that could use a Pentecost instead?
Peter's Sermon & the First Church
From conviction to a way of life
Peter doesn't soften his message for those who stay and listen. He doesn't pander to them and say "I know it wasn't you who crucified my Lord, and I know you're sorry, but..." He tells them straight up: "this Jesus whom YOU crucified" truly is the Son of God, and despite the miracles he performed in your midst, you still handed him over to be mocked, spat on, and killed. The crowd is then "cut to the heart," knowing that what Peter says is true. They had the Messiah in their midst, and they rejected him. The crowd who had formed to mock or watch left asking the only question that mattered: "what can we do to fix it?"
"Cut to the heart" (v.37) translates a single, violent Greek verb, katanyssomai, to pierce or prick sharply. This isn't polite conviction. It's the same intensity a physical wound would carry, just aimed at the conscience instead of the body. Whatever Peter said, it didn't just persuade the crowd intellectually. It wounded something in them that needed wounding.
Commentary
- Joel 2:28–32. Peter opens by quoting Joel's prophecy that God would "pour out my Spirit on all flesh" in the last days. This isn't a stray proof-text; it's Peter telling the crowd that what they just watched happen was foretold centuries earlier, not a spontaneous, unexplainable event.
- Psalm 16. Peter argues David's line "you will not let your Holy One see corruption" can't be about David himself, since David's tomb was still in Jerusalem, well known to everyone listening. He reads it instead as David prophesying the resurrection of the one who would come after him.
- Psalm 110. "The Lord said to my Lord, sit at my right hand" is the verse Peter uses to argue Jesus is now exalted at God's right hand, exactly where the Spirit they just witnessed being poured out is coming from.
The structure of this sermon (this fulfills prophecy, here is who Jesus is and what happened to him, here is what you should do about it) becomes the template for nearly every sermon in the rest of Acts.
"Repent, and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit."
Baptism is worth pausing on here. It's more than a symbolic gesture. In the moment someone is baptized in Jesus's name, they receive the same Spirit poured out at Pentecost, sealed within them in a permanent, new way. The Holy Spirit can draw a person toward faith before that moment, and that's grace too, but baptism is where the Spirit comes to dwell, where the relationship becomes definitive. Without it, someone can seek God, even love him imperfectly. Baptism is what makes that relationship complete.
"And they devoted themselves to the apostles' teaching and fellowship, to the breaking of bread and the prayers."
Koinōnia means more than "hanging out." It's the word Paul later uses for genuine partnership and shared stake in something, closer to being business partners or co-owners than acquaintances. Luke lists it as one of four things the earliest Christians devoted themselves to, right alongside doctrine, the Eucharist, and prayer, not an optional social add-on to the faith, but one of its four load-bearing pillars.
The people of the Church might not literally have everything in common. Some dress differently, speak different languages, come from different backgrounds. What the Church does is bring us together as one: one Church that follows the same teaching handed down from the earliest followers of Christ.
Reflection — Movement Four
Teaching. Am I actually being formed, or just consuming content and calling it faith?
Fellowship. Is my community real and costly, or just people I'm friendly with?
Breaking of bread. Is the Eucharist the center of my week, or an obligation I clear?
Prayer. Is it structured and regular, or only something I reach for in a crisis?
Commentary
Acts 1:18 describes Judas buying a field with the money from his betrayal and dying in a graphic fall. Matthew 27:5 says he hanged himself. This is one of the most common "the Bible contradicts itself" objections people raise. The standard harmonization: Judas hanged himself, as Matthew records, and the rope or branch gave way, causing the fall Luke describes. The field itself was purchased with the returned blood money in Judas's name by the priests. A Jewish legal idiom treats a transaction made with someone's money, even after their death, as being made "by" them. Both accounts are describing the same event from different angles, not contradicting each other.