This is he who came by water and blood, Jesus Christ, not with the water only but with the water and the blood.
And the Spirit is the witness, because the Spirit is the truth.
There are three witnesses, the Spirit, the water, and the blood; and these three agree.
If we receive the testimony of men, the testimony of God is greater; for this is the testimony of God that he has borne witness to his Son.
He who believes in the Son of God has the testimony in himself. He who does not believe God has made him a liar, because he has not believed in the testimony that God has borne to his Son.
And this is the testimony, that God gave us eternal life, and this life is in his Son.
He who has the Son has life; he who has not the Son of God has not life.