What does the Bible say about the Holy Spirit's role on Pentecost?

In Acts 2, we see the Holy Spirit arriving at the appointed time, fulfilling Jesus' promise that He would send the Comforter once He ascended. The responsibility of the Comforter is to call the Lord's people and reveal Christ to them. The disciples had waited in prayer for this event, knowing that the coming of the Spirit was crucial for their mission to proclaim the gospel. The Holy Spirit enables believers to understand and embrace faith, as spiritual insight and salvation are gifts from God alone, not achieved through human effort.