The baptism of John, was it from heaven, or of
men?
] This was a new ordinance, and John must have his authority for
administering it either from God, or from men; and Christ is
desirous to know from which he derived it in their opinion;
suggesting, that by the same authority John, his forerunner, came
baptizing, he himself came preaching and working miracles;
(See Gill on Matthew
21:25).