1 John 5:7
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The context
The letter argues for assurance through love, obedience, and the testimony given about the Son, and it closes with a series of stark contrasts. This verse in the received text names Father, Word, and Spirit as heavenly witnesses, with a threefold earthly witness following. The heavenly clause is missing from the Greek manuscripts until late and appears earlier in Latin tradition.
What it establishes
The clause is a textual addition to the letter, and its history is one of the better documented cases of a reading entering the text through copying. The earthly witness clause is present in the Greek and carries the argument.
What it does not establish
It does not establish the Trinity either way. The doctrine is argued from other passages; citing this verse invites the objection that the proof text is not in the original, and the case should not rest on it.
Short note, first pass, October 2026. Corrections welcome.
Cited in these answers
Part of Scripture, Opened — the exegetical layer behind every citation on this site. Scripture quotations are from the ESV.