This historical-critical study of the Gospel of John and the First Epistle of John challenges the commonly held view that the first Johannine epistle is related to the Gospel. Sproston argues that the two writings are indirectly related through a common Johannine tradition. A comparison of the two therefore allows traditional material in the evangelist's work to be isolated, enhancing our understanding of the creative processes involved in its composition. The account of the raising of Lazarus is rigorously analysed as a test case for this kind of analysis.