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Jesus Christ is the one who came with the water of his baptism and the blood of his death. He came not only with the water, but with both the water and the blood. And the Spirit himself testifies that this is true, because the Spirit is truth.
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There are three witnesses:
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the Spirit, the water, and the blood; and all three give the same testimony.
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We believe human testimony; but God's testimony is much stronger, and he has given this testimony about his Son.
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So those who believe in the Son of God have this testimony in their own heart; but those who do not believe God, have made a liar of him, because they have not believed what God has said about his Son.
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The testimony is this: God has given us eternal life, and this life has its source in his Son.
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Whoever has the Son has this life; whoever does not have the Son of God does not have life.