Jewish Christians from the synagogue alluded to in the Fourth Gospel continues in Revelation (especially chapters 2–3). The added feature of the Apocalypse is that now those expelled Christians face persecution from the Roman emperor cult. Indeed, by the time John the apostle wrote Revelation (ca. A.D. 95), his churches in Asia Minor faced three opponents: (1) Jewish leadership in Asia Minor persisted in expelling Jewish Christians from the synagogues. How they did so is spelled out in Revelation
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