6 This is He who came by water and blood—Jesus Christ; not only by water, but by water and blood. And it is the Spirit who bears witness, because the Spirit is truth. 7 For there are three that bear witness in heaven: the Father, the Word, and the Holy Spirit; and these three are one. 8 And there are three that bear witness on earth:[b] the Spirit, the water, and the blood; and these three agree as one. 1 John 5:6-8
Jesus came by the water and the blood. He was baptized by John the Baptist and in doing so fulfilled the will of His Father in Heaven. He came by the blood when He went to the cross and died for our sins. It is the Holy Spirit who bears witness of the truth of who Jesus Christ is. That He came not to destroy the law, but to fulfill it. In all that Jesus did He fulfilled the perfect will of the Father. Because of His death and resurrection we can have new life this day in Him.
The three who bear witness in Heaven are the Father, the Son, and the Holy Spirit. Both in John’s gospel and here, John refers to Jesus as the word. They are three in one. Some will argue against the theology of the trinity. But God is made up of the Father, Son, and Holy Spirit. They are not three separate Gods in which we serve three Gods. They are three distinct persons of the Godhead but are all one.
The three witnesses on the earth who bare witness to the truth of Jesus is the Holy Spirit, water baptism, and being born again through the shed blood of Jesus Christ. Our salvation is not based on feelings but the witness of the Holy Spirit within us. It is the Holy Spirit who transforms us from the inside out and draws us near to the Father. It is Holy Spirit who leads and guides us into all truth and reveals that Jesus is truly the Son of God. It is through God’s word that our lives are transformed. As we come to understand the depths of God’s word our lives are truly transformed into the nature and character of Christ.