3:24. The Synoptic record seemed to date the beginning of Jesus’ ministry with the death of the Baptist, but John filled in the gaps for the readers—at least a little of Jesus’ ministry commenced (preparationally?) before John the Baptist was imprisoned and his ministry brought to a close. It is sometimes asserted that the Fourth Gospel is here quietly correcting the Synoptic chronology, but this is not so. The events of John 1–3 took place early, before Mark began his account of Jesus’ ministry
John 3:24