This summary of the book of 3 John provides information about the title, author(s), date of writing, chronology, theme, theology, outline, a brief overview, and the chapters of the Book of 3 John.
The author is John the apostle. In the first verses of both 2 John and 3 John the author identifies himself as "the elder." Note other similarities: "love in the truth" (v. 1 of both letters), "walking in the truth" (v. 4 of both letters) and the similar conclusions. See Introductions to 1 John and the Gospel of John: Author.
The letter was probably written about the same time as 1 and 2 John (a.d. 85-95). See Introduction to 1 John: Date.
See Introduction to 2 John: Occasion and Purpose. Itinerant teachers sent out by John were rejected in one of the churches in the province of Asia by a dictatorial leader, Diotrephes, who even excommunicated members who showed hospitality to John's messengers. John wrote this letter to commend Gaius for supporting the teachers and, indirectly, to warn Diotrephes.
From the NIV Study Bible, Introductions to the Books of the Bible, 3 John
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