“This is the statute of the law that the LORD has commanded: Instruct the Israelites to bring you an unblemished red heifer that has no defect and has never been placed under a yoke.
2 This is the ordinance of the law. Because it could not but occur that, whilst the faithful were engaged in the world, they should often contract some pollution by their contact with its many impurities, the composition of the water is here described, by the sprinkling of which they might wash away, and expiate their uncleanness: and then certain kinds of pollution are specified, whereof the purification is required.
We have here the divine appointment concerning the solemn burning of a red heifer to ashes, and the preserving of the ashes, that of them might be made, not a beautifying, but a purifying, water, for that was the utmost the law reached to; it offered not to adorn as the gospel does, but to cleanse only.
Commenting on Numbers 19:1-10
This is the ordinance of the law which the Lord hath commanded,.... By which it appears, that this law was not of the moral, but of the ceremonial kind, being called an ordinance, a statute, a decree of God, the King of kings; and which was founded not on any clear plain reason in the thing itself, but in the will of God, who intended...