Hebrews 9:6-9; Hebrews 9:13
When these things were all in place, the priests regularly entered the first room as they performed their religious duties.
But only the high priest ever entered the Most Holy Place, and only once a year. And he always offered blood for his own sins and for the sins the people had committed in ignorance.
By these regulations the Holy Spirit revealed that the entrance to the Most Holy Place was not freely open as long as the Tabernacle and the system it represented were still in use.
This is an illustration pointing to the present time. For the gifts and sacrifices that the priests offer are not able to cleanse the consciences of the people who bring them.
Under the old system, the blood of goats and bulls and the ashes of a heifer could cleanse people’s bodies from ceremonial impurity.