There is no discrepancy between what John relates, chapter 1:33-42, respecting Andrew and Simon following Jesus at Jordan, and the account given by the other evangelists of their being called at the sea of Galilee. John describes the first interview which those two disciples had with Jesus, but says nothing regarding their subsequent call at the sea of Galilee. That Andrew and Simon, after this interview with Jesus, returned to their occupation as fishermen, is very evident from Luke's narrative, chapter 5:1-11