The Gospel according to John is traditionally attributed to John the son of Zebedee based on a line in the gospel that identifies the author as “the disciple whom Jesus loved” and testimony of early Christians, including second-century Christian Irenaeus.  Polycarp, a second-century Christian martyr who knew John personally, told Irenaeus that John had written the book during the apostle’s time serving the church in Ephesus.  The book is believed to have been written around 80 BC.

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