1 John 5:6-9

This is he that came by water and blood, even Jesus Christ; not with the water only, but with the water and with the blood. And it is the Spirit that beareth witness, because the Spirit is the truth. For there are three who bear witness, the Spirit, and the water, and the blood: and the three agree in one. If we receive the witness of men, the witness of God is greater: for the witness of God is this, that he hath borne witness concerning his Son.