Acts 2:41 records that three thousand souls were added to the church on the day of Pentecost, following Peter's sermon. This remarkable number testifies to the power of the Spirit and the effectiveness of apostolic preaching. The specificity suggests careful counting and record-keeping by the early church, and the magnitude demonstrates that Pentecost was no minor event—it launched a movement that immediately transformed thousands of lives. The figure also fulfills Jesus' promise that his followers would do even greater works than he did during his earthly ministry.