I John 5:5-7

Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?

This is he that came by water and blood, [even] Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth.

For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.