It’s Pentecost Sunday in Jerusalem, and the apostles have just been filled—and surprised, no doubt—by the Holy Spirit. A crowd forms, and everyone is trying to figure out what is going on. That’s when Peter steps up and offers an explanation. His preaching is passionate, joyful, and powerful. And at the core of his message is a proclamation that continues to be central to the message of the gospel: “God has made him both Lord and Messiah, this Jesus whom you crucified” (Acts 2:36).