This is the One who came by water and blood, Jesus Christ—not by water alone, but by water and blood. And it is the Spirit who testifies to this, because the Spirit is the truth.
But if he will not listen, take one or two others along, so that 'every matter may be established by the testimony of two or three witnesses.'
the Spirit of truth. The world cannot receive Him, because it neither sees Him nor knows Him. But you do know Him, for He abides with you and will be in you.
When the Advocate comes, whom I will send to you from the Father--the Spirit of truth who proceeds from the Father--He will testify about Me.
1 John 5:8
the Spirit, the water, and the blood--and these three are in agreement.
Treasury of Scripture
For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
1 John 5:10,11 He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son…
John 8:13,14 The Pharisees therefore said unto him, Thou bearest record of thyself; thy record is not true…
Psalm 33:6 By the word of the LORD were the heavens made; and all the host of them by the breath of his mouth.
Isaiah 48:16,17 Come ye near unto me, hear ye this; I have not spoken in secret from the beginning; from the time that it was, there am I: and now the Lord GOD, and his Spirit, hath sent me…
Isaiah 61:1 The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;
1 John 1:1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life;
John 1:1,32-34 In the beginning was the Word, and the Word was with God, and the Word was God…
Hebrews 4:12,13 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart…
1 John 5:6 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.
Matthew 3:16 And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:
John 1:33 And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost.
Deuteronomy 6:4 Hear, O Israel: The LORD our God is one LORD:
Matthew 28:19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
John 10:30 I and my Father are one.