John Chrysostom
Do you see the very types already set forth here? Lest they should say, "How can there be one sacrifice? How did the High Priest, Christ, offer it once?" the Apostle shows that it was so from of old.
The most holy and fearful sacrifice was one. Thus the Jews were prepared from ancient times. Even then, he says, the high priest offered the sacrifice once.
He also rightly says, "not without blood." It was not without blood, though not with such blood as now, for the ministry was not such.
This signified that a sacrifice would come which would not be consumed by fire, but would rather be revealed through blood.
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Since by the sacrifice the Apostle means the Cross, where there was neither fire nor wood, and which was not offered many times, but was offered once, stained with blood, he shows that the Old Testament sacrifice was also like this.
It too was offered once, with blood. "Which he offers," he says, "for himself and for the sins of ignorance of the people."
Notice that he did not say, "for sins," but "for the sins of ignorance of the people," so that they would not think highly of themselves.
Even if you sinned involuntarily, he says, still, though unwilling, you fell into ignorance. Therefore no one can be pure.
Everywhere he adds, "for himself," showing that Christ is a High Priest far higher than the Jewish high priest.
Indeed, if He had no share in our sins, how could He offer sacrifice for Himself? Why then, you ask, did the Apostle say this? To point to what is higher.