AUTHOR The Third Letter of John begins, āThe elder to Gaius the beloved, whom I love in truth.ā As with 2 John, the author of this letter identifies himself simply as āthe elderā. There is both internal evidence and external evidence that leads scholars to associate this letter with 1 John and 2 John as well as with the Gospel of John and Revelation. The internal evidence consists of a common language. As we saw in 1 John and 2 John, love and truth were dominant topics. So also, here in 3 John, those topics are introduced from the get-go. Pastor David Jackman summarizes the external evidence for the authorship of this letterā¦ From the earliest times the letter has been attributed to John the apostle, but not without debate. The early evidence is sparse, though the Muratorian Canon, a fragmentary list of New Testament books known at Rome about AD 200, certainly includes the first two letters. Irenaeus, bishop of Lyons (c. 175āc. 195), quote...