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3 John was written by 'the elder' (verse 1), the apostle John, around 85-95 AD. This is the most personal of John's three letters, addressed to a specific individual named Gaius. The letter deals with practical issues of hospitality and church leadership, contrasting the faithful Gaius with the domineering Diotrephes.

3 John contains 1 chapter with 15 verses — one of the shortest books in the Bible. The letter commends Gaius for his hospitality to traveling missionaries (verses 1-8), condemns Diotrephes for his pride and opposition (verses 9-10), and commends Demetrius as trustworthy (verses 11-12).

The main theme of 3 John is the importance of hospitality and support for Christian workers. John contrasts two models of leadership: Gaius, who generously hosts traveling teachers, and Diotrephes, 'who loves to be first' and refuses to welcome them. The letter shows that practical hospitality is a tangible expression of gospel partnership.

Key teachings include: the joy of hearing that fellow believers 'walk in the truth' (verse 4), the duty of hospitality to traveling teachers — supporting them 'in a manner worthy of God' (verse 6), the warning against Diotrephes who 'loves to be first' and excommunicates those who disagree (verses 9-10), the principle that 'anyone who does what is good is from God' (verse 11), and the commendation of Demetrius with universal testimony to his character (verse 12).

3 John provides a rare window into the practical dynamics of early church life — traveling preachers, hospitality networks, and power struggles. The contrast between Gaius and Diotrephes serves as a timeless warning against self-centered leadership in the church. The letter shows that mundane acts like hosting missionaries are essential to the gospel mission, while authoritarian control is antithetical to it.