The particulars of this subject relate to the sacrifice which was an eminent type of our Savior, He being the antitype.
Hebrews 9:14, “How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?”
Numbers 19:2, “This is the ordinance (statute) of the law which the LORD has commanded, saying, speak unto the children of Israel, that they bring thee a red heifer (a type of Christ) without spot, wherein is no blemish, and upon which never came yoke.” Compare with,
1 Peter 1:19, “With the precious blood of Christ (the antitype), as a lamb without blemish and without spot.”
The virtue of purification from defilement did not reside in the abundance of water the priests washed themselves in, but the purifying lies in the ashes of the heifer that were in the water, however small the quantity may have been. Also after the red heifer was sacrificed, her blood was sprinkled at the door of the tabernacle.
Hebrews 9:10, “washings” Verse 13, “For if the blood of bulls and of goats, and the ashes of a heifer (in the water) sprinkling the unclean, sanctifies (sets apart) to the purifying of the flesh: how much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God (the Father), purge (cleanse) your conscience from dead works to serve the living God?”
As for today, no red heifer can be burnt under the present condition of the Jews, because the priests cannot, on their own legal principles, be fully purified from the defilement communicated by the dead, meaning those who had come in contact with the dead. They can wash their clothes, their furnishings, their rooms, etc., but the ashes of a red heifer, one without spot or blemish is needed for the purification of the priests involved.
Not sure if there are any red heifers left?