Hebrews 10:1; Hebrews 10:3-4; Hebrews 10:8; Hebrews 10:11
The old system in the law of Moses was only a shadow of the things to come, not the reality of the good things Christ has done for us. The sacrifices under the old system were repeated again and again, year after year, but they were never able to provide perfect cleansing for those who came to worship.
But just the opposite happened. Those yearly sacrifices reminded them of their sins year after year.
For it is not possible for the blood of bulls and goats to take away sins.
Christ said, "You did not want animal sacrifices or grain offerings or animals burned on the altar or other offerings for sin, nor were you pleased with them" (though they are required by the law of Moses).
Under the old covenant, the priest stands before the altar day after day, offering sacrifices that can never take away sins.