The Gospel of John.

The Gospels, the first four books of the New Testament, tell the story of the life of Jesus. Yet only one—the Gospel of John—claims to be an eyewitness account, the testimony of the unnamed “disciple whom Jesus loved.” (“This is the disciple who is testifying to these things and wrote these things, and we know that his testimony is true” [John 21:24]). Who wrote the Gospel of John is a question that remains unanswered, though noted theologians throughout the ages maintain that it was indeed the disciple John who penned the famous Biblical book. Bible History Daily.