What does the Bible say about the role of the Holy Spirit in Pentecost?

The role of the Holy Spirit at Pentecost was pivotal in the empowerment of the apostles to preach boldly and effectively. Acts 2 describes how the Holy Spirit filled the apostles, allowing them to speak in various languages, thus spreading the message of Christ to devout Jews from all nations gathered in Jerusalem. This event fulfills the promise of Jesus that the Holy Spirit would guide and empower them in their mission. Furthermore, the Holy Spirit is actively involved in transforming the hearts of those who hear the gospel, bringing spiritual understanding and enabling faith in Christ, which is fundamentally important for the growth of the church.