Read Hebrews 10:2 Using Other Translations
For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.
Otherwise, would they not have ceased to be offered, since the worshipers, having once been cleansed, would no longer have any consciousness of sins?
If they could have provided perfect cleansing, the sacrifices would have stopped, for the worshipers would have been purified once for all time, and their feelings of guilt would have disappeared.