John Chrysostom

Then also there are other points: He is made Priest (he says) by Another and does not of Himself intrude into the office. This too is common, "And no man taketh this honor to himself, but he that is called of God as was Aaron."

Here again he conciliates them in another point, because He was sent from God: which Christ was wont to say throughout to the Jews. "He that sent Me is greater than I," and, "I came not of Myself."

He appears to me in these words also to hint at the priests of the Jews, as being no longer priests, but intruders and corrupters of the law of the priesthood...