The Third Epistle of John, often referred to as 3 John, is one of the shortest books in the New Testament.Author: The letter is traditionally attributed to the Apostle John, who also wrote the Gospel of John, 1 John, and 2 John.Recipient: It is addressed to a man named Gaius, who is commended for his faithfulness and hospitality.Content: The letter primarily focuses on three individuals:Gaius: Praised for his hospitality and support of traveling missionaries.Diotrephes: Criticized for his pride, refusal to welcome the missionaries, and his attempts to assert control over the church.Demetrius: Commended for his good testimony and faithfulness.Themes: The main themes include hospitality, support for fellow believers, and the importance of Truth and Love in the Christian community.