1 John 5:6-8

⁶ 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.

⁷ For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.

⁸ And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.