III John
Author: the apostle John
Place of writing: presumably, the city of Ephesus
Time of writing: approximately 90 A.D.
John’s third letter, just as his first two, was probably written from Ephesus, at about the same time that his second letter was written. This letter is not addressed to believers in general (as his first), nor to a specific church (as his second), but instead to a specific believer named Gaius. Just as John was overjoyed to hear of the church walking in truth, in his second letter, he is now overjoyed to hear of Gaius walking in the truth.
John begins his epistle by commending Gaius for the love which he displays to his brothers in Christ; then he warns him about Diotrephes, who loves to be in pre-eminence but opposes the true followers of Christ; and finally, he gives a good report about Demetrius.