Imperfect priesthood with a weak law. The law was only brought in to condemn Christ, thereby removing sin forever, God's commandment is eternal life. Believe it and be saved
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? For the priesthood being changed, there is made of necessity a change also of the law. Hebrews 7:11-12
For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God. Hebrews 7:19
For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: Romans 8:3
The Ten Commandments is the law that defines what sin is when breaking 1 John 3:4 James 2:10-12 Rom 7:7 Mat 5:19-30
The law of Moses, with the earthy priesthood and animal sacrifices is the law that was added as a prescription for transgressing God;s law until Jesus came. Heb 10:1-22 Heb 9:9-14
The law being referred to in Heb7 is the law on the priesthood because the law said it had to come from the tribe of Levi and Jesus came from the tribe of Judah so in order for Jesus to be our High Priest, the priesthood law had to change, not the law that we can now worship other gods, steal, or break the least of these that defines sin. It was week because the priesthood was based on man, in the New Covenant, the better promise is Jesus is now our High Priest so instead of sacrificing animals for sin- breaking God's law- we can go directly to Jesus when we repent and confess our sins. His blood can cleanse us of all unrighteousness and when He heals He says Go and sin no more. Meaning God and keep the commandments as sin is the transgression of His law. Sin didn't change, just how they are forgiven has changed.
Heb 7:14
For it is evident that our Lord arose from Judah, of which tribe Moses spoke nothing concerning [c]priesthood. 15 And it is yet far more evident if, in the likeness of Melchizedek, there arises another priest 16 who has come, not according to the law of a fleshly commandment, but according to the power of an endless life. 17 For [
d]He testifies:
“You
are a priest forever
According to the order of Melchizedek.”
18
For on the one hand there is an annulling of the former commandment because of its weakness and unprofitableness, (of the Levitical priesthood, the context)19 for the law made nothing [
e]perfect; on the other hand,
there is the bringing in of a better hope, through which we draw near to God.
20 And inasmuch as
He was not
made priest without an oath 21 (for they have become priests without an oath, but He with an oath by Him who said to Him:
“The Lord has sworn
And will not relent,
‘You
are a priest [
f]forever
According to the order of Melchizedek’ ”),
22 by so much more Jesus has become a [
g]surety of a better covenant.
23 Also there were many priests, because they were prevented by death from continuing. 24
But He, because He continues forever, has an unchangeable priesthood. 25 Therefore He is also able to save [
h]to the uttermost those who come to God through Him, since He always lives to make intercession for them.
26 For such a High Priest was fitting for us,
who is holy, [
i]harmless, undefiled, separate from sinners, and has become higher than the heavens; 27
who does not need daily, as those high priests, to offer up sacrifices, first for His own sins and then for the people’s, for this He did once for all when He offered up Himself. 28
For the law appoints as high priests men who have weakness, but the word of the oath, which came after the law, appoints the Son who has been perfected forever.
The bible is not meant to be read, it is meant to be prayerfully studied and context is so important. There is a real spiritual war out there and the devil is doing everything in his power to lead people astray. God's Word is to be the light to our path Psa 119:105 and while its easy to listen to popular teachings of man, if it doesn't line up with the bible its dangerous. Only God's Truth sets us free. Every time we start believing a lie its puts us in the devils captivity.