The priest shall take cedar-wood, and hyssop, &c.— See Leviticus 14:4. The Apostle, Hebrews 9:19 mentions scarlet wood and hyssop as used by Moses himself when he sprinkled the book of the covenant, &c. with the blood of the sacrifice; and therefore these things, which appear to have been used of old, as cleansers either of inward or outward filth, are ordered here to be burnt with the ashes of the heifer, which were to be mingled with the water of purification, as proper to denote its virtue to cleanse from legal pollutions those who were sprinkled with it.
Related Commentaries of Numbers 19:6
Numbers 19:6
6 And the priest shall take cedar wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.