Hebrews 9:18,19 - Not put into effect without blood

9:18

Throughout Hebrews the writer is stressing that the new covenant is infinitely superior to the old covenant, and that it supersedes it. However, he at no point says that the old covenant was not relevant nor was of no consequence. The old covenant was a perfectly good covenant for the purpose for which God intended it, and it was put into effect through the blood of the sacrifices.

9:19

We now get a description of how it was put into effect through sacrifice. Moses read out the Law, then having completed that he took the blood of calves and sprinkled the altar, the scroll and the people. The covenant covered God, and the people. They genuinely were under this covenant.