Numbers 19:6

6And the priest shall take cedar-wood. That the sprinkling of the blood might be conjoined with that of the water, the cedar-wood, and hyssop, and scarlet, thread, with which the sprinkling was wont to be made, were cast into the fire; for, unless the Israelites had been admonished by this visible sign, they would not have so clearly known that they were not only washed with the water, but that by the offering of the sacrifice also their uncleanness was removed. But it was not enough that the blood should be poured forth, unless, as has been already seen, they were purified by its aspersion. But, for as much as the scent of cedar-wood is precious, and in hyssop there is a cleansing property, we gather from hence also that the victim was pure, although it bore their sins together with the curse and expiation. Peter teaches us how we are sprinkled with the blood of Christ, viz., through the Spirit, (1 Peter 1:2;) nay, John shews us in his Canonical Epistle, that we find all the parts of this ceremony in Christ, where he writes that Christ “came by water and blood,” and “it is the Spirit that beareth witness, because the Spirit is truth.” (1 John 5:6.)