The "Epistle of John" refers to a series of letters found in the New Testament of the Christian Bible, traditionally attributed to the Apostle John. These letters, specifically 1 John, 2 John, and 3 John, address early Christian communities, offering guidance on faith, love, and the nature of God. In 1 John, the focus is on the importance of love and the assurance of eternal life through belief in Jesus Christ. 2 John warns against false teachings, while 3 John commends a church leader named Gaius for his hospitality and support of traveling missionaries.