Sorry I respectfully disagree as shown by the scripture and chapter context and subject matter your disregarding. It seems you think that the law mentioned in
Hebrews 7 is talking about Gods' 10 commandments? Prove it? I bet you cannot because the chapter context and subject matter is to the laws of the Levitical Priesthood.
Here is the context and subject matter you left out which is the changing of the law of the Levitical Priesthood because Jesus was of the tribe of Judah (only Levites could be Priests under old covenant law)...
Hebrews 7: 11-18 [11],
If therefore perfection were by the Levitical priesthood, for under it the people received the law, what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron? [12],
For the priesthood being changed, there is made of necessity a change also of the law. [13], For he of whom these things are spoken pertains to another tribe, of which no man gave attendance at the altar. [14], For it is evident that our Lord sprang out of Juda; of which tribe Moses spoke nothing concerning priesthood. [15], And it is yet far more evident: for that after the similitude of Melchisedec there rises another priest, [16], Who is made, not after the law of a carnal commandment, but after the power of an endless life. [17], For he testifies, You are a priest for ever after the order of Melchisedec. [18],
For there is truly a cancellation of the commandment going before for the weakness and unprofitableness thereof.
Hebrews 7:28,
For the law makes men high priests which have infirmity; but the word of the oath, which was since the law, makes the Son, who is consecrated for ever more.
Hebrews 9:9 Which was a figure for the time then present, in which were offered both gifts and sacrifices, that could not make him that did the service perfect, as pertaining to the conscience
The changing of the law in
Hebrews 7 is the changing of the law of the Priesthood and the old covenant laws for remission of sins and animal sacrifices not Gods' 10 commandments. Your disregarding chapter context and subject matter as your friend was earlier and reading into the scriptures (eisegesis) what the scriptures do not say or do not teach.
Hebrews 7:11? Under the Levitical Priesthood the people received the laws for remission of sins through animal sacrifices and sin offerings for blood atonement (see Hebrews 8; Hebrews 9 and Hebrews 10) not God's 10 commandments. This is the context and subject matter your disregarding in Hebrews. Also, think it through, the people did not receive Gods' 10 commandments from the Levitical Priesthood or Aaron did they? They received it directly from God and through Moses (tables of stone). Your claim that Hebrews 7 is talking about Gods' 10 commandments is simply not biblical or supported by scripture. As shown through scripture context and subject matter, the runaround is your side not mine so we may have to agree to disagree.