John Chrysostom

"Above when He said, Sacrifice, and offering, and burnt-offerings, and offering for sin Thou wouldest not, neither hadst pleasure therein, which are offered by the Law, then He said, Lo! I come to do Thy will, O God! He taketh away the first that He may establish the second." So that henceforward this is done in vain, although it is done; for what need is there of medicines where there are no wounds? On this account He ordained offerings "continually," because of their want of power, and that a remembrance of sins might be made.

Homily on Hebrews 17 ↗

Oecumenius

"you did not desire nor did you take pleasure in."Paul himself interprets the Davidic more clearly. "which are offered according to the law," that is, the Jewish law, and they are offered by the Jews. Do you see that before the descent, the sacrifices were hated?

The Pseudo-Oecumenian Catena on Hebrews ↗

Thomas Aquinas

491. – Then when he says, when he said above, he explains the authority he quoted. In regard to this he does two things: first, by assigning the order in which he shall speak, he states the difference between the Old and New Testaments; secondly, he explains in detail something presupposed by the authority (v. 10). 492. – We have said that two things were touched upon in the authority cited: one pertains to the rejection of the Old Testament; the other to the approval of the New. …

Commentary on Hebrews ↗