What examples from the Bible illustrate the power of preaching?

In the Book of Acts, we find numerous instances that illustrate the power of preaching. A prime example is Peter's sermon at Pentecost (Acts 2), where he proclaimed the risen Christ with conviction and clarity. The result of this powerful preaching was that about three thousand souls were added to the Church that day. This illustrates not only the effectiveness of preaching empowered by the Holy Spirit, but also showcases how God uses sermons to call His people to repentance and faith. Each act of preaching in Acts reveals the consistent message of Christ's death and resurrection, affirming God's choice of preaching as the means through which He brings people to Himself.