1 John 5:5-8

Who is it that overcomes the world, but the one who believes that Jesus is the Son of God? This is He who came by water and blood—Jesus Christ. He did not come by water only, but by water and blood. It is the Spirit who bears witness, because the Spirit is the truth. There are three who testify in heaven: the Father, the Word, and the Holy Spirit, and the three are one. There are three that testify on earth: the Spirit, the water, and the blood, and the three are toward the one.