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This is the clearest, and pretty much the only, expression of the Trinitarian concept in
the Bible. It is not, however, found in the earliest Greek manuscripts and is omitted from most
modern translations. Here, for example, are verses 5:7-8 in the New Revised
Standard Version:
"There are three that testify: the
Spirit and the water and the blood, and these three agree."
Not all Christians agree about how these verses (often called the Johannine comma) should be treated. See here for a KJV-only defense. 5:7-8