John Lightfoot on Matthew 7:29

[As one having authority, and not as the scribes.] It is said with good reason, in the verse going before, that "the multitude were astonished at Christ's doctrine": for, besides his divine truth, depth, and convincing power, they had not before heard any discoursing with that authority, that he did. The scribes borrowed credit to their doctrine from traditions, and the fathers of them: and no sermon of any scribe had any authority or value, without The Rabbins have a tradition, or The wise men say; or some traditional oracle of that nature. Hillel the Great taught truly, and as the tradition was concerning a certain thing; "But, although he discoursed of that matter all day long, they received not his doctrine, until he said at last, So I heard from Shemaia and Abtalion."