Hebrews 10:1-4

For since the Law has only a shadow [just a pale representation] of the good things to come—not the very image of those things—it can never, by offering the same sacrifices continually year after year, make perfect those who approach [its altars]. For if it were otherwise, would not these sacrifices have stopped being offered? For the worshipers, having once [for all time] been cleansed, would no longer have a consciousness of sin. But [as it is] these [continual] sacrifices bring a fresh reminder of sins [to be atoned for] year after year, for it is impossible for the blood of bulls and goats to take away sins.