What does the Bible say about the Holy Spirit's work at Pentecost?

At Pentecost, the Holy Spirit was given as a fulfillment of Christ's promise to His disciples, immersing them in His presence. This event marked a significant shift, demonstrating that the Holy Spirit was not limited to the Jewish nation but was to work among all people, gathering the elect from every nation. The manifestation of the Spirit through the apostles' speaking in tongues illustrated His role in empowering believers to share the Gospel throughout the world. The Spirit's work encompasses both the gathering of God's chosen people and the indwelling of every believer, signifying salvation and new life in Christ.