What does Hebrews 9:21 mean?

Therefore even the first covenant has not been dedicated without blood.

For when every commandment had been spoken by Moses to all the people according to the law, he took the blood of the calves and the goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,

saying, “This is the blood of the covenant which God has commanded you.”

According to the law, nearly everything is cleansed with blood, and apart from shedding of blood there is no remission.

It was necessary therefore that the copies of the things in the heavens should be cleansed with these; but the heavenly things themselves with better sacrifices than these.

For Christ hasn’t entered into holy places made with hands, which are representations of the true, but into heaven itself, now to appear in the presence of God for us;