The meaning of John, Third Epistle of in the Bible
(From Easton's Bible Dictionary)

is addressed to Caius, or Gaius, but whether to the Christian of that name in Macedonia (Acts 19:: 29) or in Corinth (Romans 16:23) or in Derbe (Acts 20:4) is uncertain. It was written for the purpose of commending to Gaius some Christians who were strangers in the place where he lived, and who had gone thither for the purpose of preaching the gospel (ver. 7).

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