Matthew 3:14

John rejects Him from baptism as God; He teaches him, that it ought to be performed on Him as man.

For this cause, let me add, John also by way of anticipation said all that he had said before, that he "was not worthy to unloose the latchet of His shoe;" and all the rest, as for instance, that He is Judge, and rewards every man according to his desert, and that He will bestow His Spirit abundantly on all; in order that when thou shouldest see Him coming to the baptism, thou mightest not suspect anything mean. Therefore he forbids Him, even when He was come, saying, "I have need to be baptized of Thee, and comest Thou to me?" For, because the baptism was "of repentance," and led men to accuse themselves for their offenses, lest any one should suppose that He too "cometh to Jordan" in this sort of mind, John sets it right beforehand, by calling Him both Lamb, and Redeemer from all the sin that is in the world. Since He that was able to take away the sins of the whole race of men, much more was He Himself without sin. For this cause then he said not, "Behold, He that is without sin," but what was much more, He "that beareth the sin of the world," in order that together with this truth thou mightest receive that other with all assurance, and having received it mightest perceive, that in the conduct of some further economy He cometh to the baptism.

That Thou shouldest baptize me there is good cause, that I may be made righteous and worthy of heaven; but that I should baptize Thee, what cause is there? Every good gift comes down from heaven upon earth, not ascends from earth to heaven.