'Law' in the Bible

The sons of Levi who receive the priestly office have a command according to the law to collect a tenth from the people—that is, from their brothers—though they have also descended from Abraham.

If then, perfection came through the Levitical priesthood (for under it the people received the law), what further need was there for another priest to appear, said to be in the order of Melchizedek and not in the order of Aaron?

For when there is a change of the priesthood, there must be a change of law as well.

(for the law perfected nothing), but a better hope is introduced, through which we draw near to God.

For the law appoints as high priests men who are weak, but the promise of the oath, which came after the law, appoints a Son, who has been perfected forever.

Now if He were on earth, He wouldn’t be a priest, since there are those offering the gifts prescribed by the law.

For when every command had been proclaimed by Moses to all the people according to the law, he took the blood of calves and goats, along with water, scarlet wool, and hyssop, and sprinkled the scroll itself and all the people,

According to the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness.

Since the law has only a shadow of the good things to come, and not the actual form of those realities, it can never perfect the worshipers by the same sacrifices they continually offer year after year.

After He says above, You did not want or delight in sacrifices and offerings, whole burnt offerings and sin offerings (which are offered according to the law),

If anyone disregards Moses’ law, he dies without mercy, based on the testimony of two or three witnesses.