According to the [Old Testament] law, without the shedding of blood, there is no remission of sin. We must therefore emphasize that the Christian faith is a religion founded on blood sacrifice. Moreover the shedding of blood in the older covenant was not intended to be efficacious, but rather typological through animals. The Christian faith is built on the foundation of a human sacrifice but in the Old Covenant it was animals. If sin is to be dealt with, blood must flow. To the modernist, this seems barbaric—but it deals with the fact of sin. The only way to avoid blood sacrifice in religion is to traffic in wishful thinking. Scripture teaches us here that the tabernacle in the heavens needed to be purified. Because it is in the heavens, only the blood of Christ would suffice to accomplish this. The blood of bulls and goats could purify the tabernacle here, but in the heavenlies only the true and ultimate sacrifice was worthy. This relates to our sense of Christian finality. Christ came at the “end of the ages.” An air of finality attended his arrival, his ministry, his work. His work was to put away sin. Christ was offered one time in the same way that each man dies one time. First is the death, an event in history, and after the death follow the consequences of the nature of that death. Christ died for the many, and after that death, their sins were put away. Each man dies in history, and after that follows the judgment. Nothing is more certain than the inevitability of your death, and nothing is more certain than the judgment that will follow that death. The question each one of us must ask ourselves regularly is this: Do we have a high priest who has put away our sins? Do we have a sacrifice in the heavens? Do we have Christ?

Douglas Wilson,  'Hebrews Through New Eyes: Christ and His Rivals