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What the source reads — He who was revealed in the flesh
What this version reads — God was manifest in the flesh
The oldest manuscripts read ὅς ('who'); the Textus Receptus reads θεός ('God'). In the old nomina-sacra script the two are one stroke apart — ΟΣ against ΘΣ. A single added line turns a relative pronoun into a proof-text for the deity of Christ.
Read this chapter side by side — 1 Timothy 3:16 →