Hebrews 10:1-4

The old system of living under the law presented us with only a faint shadow, a crude outline of the reality of the wonderful blessings to come. Even with its steady stream of sacrifices offered year after year, there still was nothing that could make our hearts perfect before God. For if animal sacrifices could once and for all eliminate sin, they would have ceased to be offered and the worshipers would have clean consciences. Instead, once was not enough so by the repetitive sacrifices year after year, the worshipers were continually reminded of their sins, with their hearts still impure. For what power does the blood of bulls and goats have to remove sin’s guilt?