{Now when he heard} (akousas de). The reason for Christ's
return to Galilee is given here to be that John had been
delivered up into prison. The Synoptic Gospels skip from the
temptation of Jesus to the Galilean ministry, a whole year. But
for  Joh 1:19-3:36  we should know nothing of the "year of
obscurity" (Stalker). John supplies items to help fill in the
picture. Christ's work in Galilee began after the close of the
active ministry of the Baptist who lingered on in prison for a
year or more.