In 31 AD, after His crucifixion, Jesus appeared to His disciples and breathed on them, declaring, Receive you the Holy Spirit. He presented it as a gift from their Father, instructing them to wait in Jerusalem to receive it. With the receiving of the Holy Spirit comes the responsibility of living in a manner that reflects a light to the world through the correct way of living. This responsibility is crucial, as it is for the sake of the elect that Jesus will cut the days short to save the world. At Pentecost, the disciples were assembled in unity when a mighty wind sound filled the house, though no air moved, and tongue-shaped flames of fire appeared above them, resting on each without heat. They were filled with the Holy Spirit, and the power of God manifested as they began to speak in unfamiliar languages, astonishing all present. The gathered multitude, devout men from every country, heard the Galileans speak in their own languages and dialects, witnessing the wonderful works of God. This marked the introduction of God's Holy Spirit to the world, now made available to mankind upon being called by God the Father. God's Holy Spirit is the power of God in action, inspiring and accomplishing feats through individuals, as seen in the courage and strength of David's mighty men. This Spirit teaches personally, shaping the will of those it guides by communicating righteous knowledge. It reminds us of Jesus' obedience, faith, and character, urging us to imitate Him. The Holy Spirit bears witness to the way Christ lived, amplifying God's laws, His love, concern for others, and the absolute truth of God's Kingdom. The Holy Spirit also convicts the world of sin, righteousness, and judgment, bringing an acute sense of guilt and awareness of sin that cannot be ignored. It reveals the necessity of righteous living under God's laws, showing that Jesus overcame satan and that sin will be condemned. Furthermore, it guides into all divine truth, setting us free from the lies and superstitions of the world, declaring God's will individually to each of us. Given as a gift to the first fruits, the Holy Spirit is a down payment of our inheritance as members of the God family. It seals us, marking us as genuine and approved by God. This gift, meant to be cherished, assists in fulfilling our calling, helping us overcome and develop godly character amidst the pulls of the world and the wiles of satan. Through the Holy Spirit, God guides His church, encouraging stability and fellowship among brethren, ensuring we resist sin and grow in obedience, love, and hope for the final transformation into Spirit beings.

John's final witness of Christ's Messiahship is the Holy Spirit. In John 15:26-27 Jesus states that when the Helper comes whom He shall send from the Father the Spirit of truth who proceeds from the Father He will testify of Him and the disciples also will bear witness because they have been with Him from the beginning. The Holy Spirit does not have to speak to testify. The presence of the Holy Spirit in an individual testifies or makes a witness in the same way the presence of Christ's blood spilling onto the ground made a silent witness. When the disciples received the Holy Spirit its presence would make a witness of who Christ is because Christ would then be dwelling in them through that Spirit. The presence of God's Spirit would testify of God not necessarily by any spoken word but by the evidence of a changed life. Christ states that when the Holy Spirit came upon the disciples they would receive power and would be witnesses of Him to the ends of the earth. When someone has the Holy Spirit that person's life will produce evidence in the form of love joy peace longsuffering kindness goodness faithfulness gentleness and self-control. A life bearing the fruit of the Spirit is impossible to hide and will be a more effective testimony than anything spoken. John singles out the water the blood and the Spirit because these three witnesses identify not only the firstborn Son of God but also all the sons of God. Just as Christ foretold that His disciples would receive the Holy Spirit after His blood atoned for their sins so believers also receive God's Spirit after they have been washed clean and justified by Christ's blood. The same Spirit that testified in the lives of the disciples pointing to God's work in them will likewise testify in the lives of believers.