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John the Apostle is traditionally believed to be one of two disciples (the other being Andrew) recounted in John 1:35–39, who upon hearing the Baptist point out Jesus as the "Lamb of God", followed Jesus and spent the day with him, thus becoming the first two disciples called by Jesus. On this basis some traditions believe that John was first a disciple of John the Baptist, even though he is not named in this episode.
Background information source: Wikipedia