John Calvin Commentary Hebrews 10:9

"then hath he said, Lo, I am come to do thy will. He taketh away the first, that he may establish the second." — Hebrews 10:9 (ASV)

He taketh away, and so on. See now why and for what purpose this passage was quoted, so that we may know that the full and perfect righteousness under the kingdom of Christ stands in no need of the sacrifices of the Law. For when they are removed, the will of God is set up as a perfect rule.

It therefore follows that the sacrifices of beasts were to be removed by the priesthood of Christ, as they had nothing in common with it. For, as we have said, there was no reason for him to reject the sacrifices on account of some incidental fault. He is not dealing with hypocrites, nor is he condemning the superstition of perverted worship. Rather, he denies that the usual sacrifices are required of a pious man rightly instructed, and he testifies that God is fully and perfectly obeyed without sacrifices.