Early traditions help to identify the author as John.Irenaeus, a disciple of John's disciple Polycarp, is of the earliest extant sources to associate John with the fourth Gospel.It would perhaps be best to first establish the case that the same author is responsible for all the books associated with John.The New Testament books of John, 1 John, 2 John, 3 John and Revelation are sometimes called the Johannine literature and are traditionally assigned to John the son of Zebedee, one of the twelve disciples of Jesus.Author: John –24 describes the author of the gospel of John as “the disciple whom Jesus loved,” and for both historical and internal reasons this is understood to be John the Apostle, one of the sons of Zebedee (Luke ).Date of Writing: Discovery of certain papyrus fragments dated around AD 135 require the gospel of John to have been written, copied, and circulated before then.And, while some think it was written before Jerusalem was destroyed (AD 70), AD 85—90 is a more accepted time for the writing of the gospel of John.Purpose of Writing: The author cites the purpose of the gospel of John as follows: “But these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name” (John ).
Jesus often took Peter, James, and John aside defining them as an inner circle of disciples (-24; 20:2-10; 21:2, 7, 20ff.).“Jesus answered and said to them, ‘This is the work of God, that you believe in Him whom He sent’” (John ).“The thief does not come except to steal, and to kill, and to destroy.The attributions within these books are not at all clear on this point, since the Gospel of John and 1 John are anonymous, 2 John and 3 John are letters from The Elder, and the Revelation is given to simply His servant John (Rev 1:1).Still, there is reason to believe that the traditional understanding here is correct.He would have also had a decent familiarity with Palestine before the destruction of the temple in AD 70, and would have been familiar with the Jewish way of life.John the Apostle does fit the description, but it is not exclusive to him.John’s Gospel is rather different from the other three.Whether or not he knew them (or any one of them) continues to be debated.John emphasized Jesus Christ as “the Son of God,” fully God and fully man, contrary to a false doctrine that taught the “Christ-spirit” came upon the human Jesus at His baptism and left Him at the crucifixion. “The next day John saw Jesus coming toward him, and said, ‘Behold!Key Verses: “In the beginning was the Word, and the Word was with God, and the Word was God. The Lamb of God who takes away the sin of the world! “For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life” (John ).The author is the apostle John, “the disciple whom Jesus loved” ( [see note there]; ; 20:2;21:7,20,24).He was prominent in the early church but is not mentioned by name in this Gospel—which would be natural if he wrote it, but hard to explain otherwise. Like the other Gospels, the title "According to John" () is found in the earliest manuscripts.