For the priesthood being changed, there is made of necessity a change also of the law.
Read Chapter 7
George Leo Haydock
After giving a decided preference to Melchisedech, and his priesthood, over the Levitical priesthood, St. Paul proves the abrogation of the latter, and even of the law, by the introduction of a new priesthood, according to the order of Melchisedech.
And what is the meaning of what follows? For (he says) under [or upon] it the people have received the Law [or have been legislated for]. What is under it [&c.]? Orders itself by it; through it does all things. You cannot say that it was given to others, the people under it have received the law, that is, have used it, and did use it. You cannot say indeed that it was perfect, it did not govern the people; they have been legislated for upon it, that is, they used it.
What need was there then of another priesthood? For the priesthood being changed, there is of necessity a change of the law also. But if there must be another priest, or rather another priesthood, there must needs be also another law. This is for those who say, What need was there of a new Covenant? For he could indeed have alleged a testimony from prophecy also. This is the covenant which I made with your fathers [&c.]. Hebrews 8:10 But for the present he contends on the ground of the priesthood. And observe, how he sa...