The earthly sanctuary services were appointed of God to help man know and understand exactly what God was willing to do for him. Every animal slain by the hand of the sinner was to be a miniature Calvary. It was to reveal to man the deep-seated enmity he held against God, but in the same instant to prove to him that God held nothing back, not even His Son, if by any means He could bring man to see his rebellion. It was in this way that God prepared the catalyst to break the proud and stubborn heart of man. Nothing less than “blood” could wash away such an awful sin as his, i.e., the will to kill God.
Donald Short, A Study on the Cleansing of the Sanctuary