As the shortest book in the New Testament by word count, 3 John is a intensely personal and practical note from “the elder” to a beloved Christian named Gaius. It offers a fascinating glimpse into the life of the early church, centered on the vital practice of hospitality. The elder praises Gaius for generously welcoming traveling missionaries, urging him to continue this support as a “fellow worker for the truth.” This encouragement is set against a sharp warning about a local church leader, Diotrephes, whose pride has led him to reject the elder’s authority and slander his messengers. The letter champions the simple but profound virtues of walking in truth, imitating good, and actively supporting the work of the gospel, providing a timeless model of faithful Christian living.