Mark 1:4 - Ellicott's Commentary On The Whole Bible

John did baptize. — No other Gospel passes so abruptly, so in medias res, into the actual work of the Forerunner. There is no account of the birth or infancy of our Lord, as in St. Matthew and St. Luke; none of the pre-existence of the Son of Man, as in St. John. St. Mark is here, as elsewhere, emphatically the Evangelist of action. (On the rest of the verse, see Notes on Matthew 3:1.) The special phrase “baptism of repentance” — i.e., the sign of repentance, that which was connected with it, and pre-supposed it — meets us in Luke 3:3 and Acts 19:4. In the former passage we find also “forgiveness of sins” as the result of the baptism; and we cannot doubt, therefore, that then, as evermore, repentance was followed by forgiveness, even though the blood which availed for that forgiveness (Matthew 26:28) had not as yet been shed.