The blood of the sin-offering was to be washed out of the clothes on which it should happen to be sprinkled, which signified the regard we ought to have to the blood of Christ, not counting it a common thing.
The vessel in which the flesh of the sin-offering was boiled must be broken, if it were an earthen one; but if a brazen one, well washed. This showed that the defilement was not wholly taken away by the offering; but the blood of Christ thoroughly cleanses from all sin.
All these rules set forth the polluting nature of sin, and the removal of guilt from the sinner to the sacrifice. Behold and wonder at Christ's love, in that he was content to be made a sin-offering for us, and so to procure our pardon for continual sins and failings.
He that knew no sin was made sin (that is, a sin-offering) for us, 2Co 5:21. Hence we have pardon, and not only pardon, but power also, against sin, Ro 8:3.