Hebrews 9:13

13.For if the blood of bulls, etc. This passage has given to many all occasion to go astray, because they did not consider that sacraments are spoken of, which had a spiritual import. The cleansing of the flesh they leave explained of what avails among men, as the heathens had their expiations to blot out the infamy of crimes. But this explanation is indeed very heathenish; for wrong is done to God’s promises, if we restrict the effect to civil matters only. Often does this declaration occur in the writings of Moses, that iniquity was expiated when a sacrifice was duly offered. This is no doubt the spiritual teaching of faith. Besides, all the sacrifices were destined for this end, that they might lead men to Christ; as the eternal salvation of the soul is through Christ, so these were true witnesses of this salvation.

What then does the Apostle mean when he speaks of the purgations of the flesh? He means what is symbolical or sacramental, as follows, — If the blood of beasts was a true symbol of purgation, so that it cleansed in a sacramental manner, how much more shall Christ who is himself the truth, not only bear witness to a purgation by an external rite, but also really perform this for consciences? The argument then is from the signs to the thing signified; for the effect by a long time preceded the reality of the signs.