The Third Epistle of John is a brief letter found in the New Testament of the Christian Bible. Traditionally attributed to the Apostle John, it addresses a man named Gaius, commending him for his hospitality towards traveling Christian missionaries. The letter emphasizes the importance of supporting those who spread the message of Jesus Christ. In addition to praising Gaius, the epistle also criticizes a man named Diotrephes, who refuses to welcome these missionaries and seeks to assert authority over the church. The letter encourages believers to follow good examples and remain faithful to the teachings of Christ.