A clean person shall take hyssop and dip it in the water, and sprinkle it on the tent and on all the furnishings and on the persons who were there, and on the one who touched the bone or the one slain or the one dying naturally or the grave.

For when every commandment had been spoken by Moses to all the people according to the Law, he took the blood of the calves and the goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,

And

For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have been defiled sanctify for the cleansing of the flesh,

but if we walk in the Light as He Himself is in the Light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.

and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. To Him who loves us and released us from our sins by His blood—

Whiter

“Come now, and let us reason together,”
Says the Lord,
“Though your sins are as scarlet,
They will be as white as snow;
Though they are red like crimson,
They will be like wool.

so that He might sanctify her, having cleansed her by the washing of water with the word,

Then one of the elders answered, saying to me, “These who are clothed in the white robes, who are they, and where have they come from?”

General references

Anyone, moreover, who touches his bed shall wash his clothes and bathe in water and be unclean until evening;

for it is on this day that atonement shall be made for you to cleanse you; you will be clean from all your sins before the Lord.

The priest shall take cedar wood and hyssop and scarlet material and cast it into the midst of the burning heifer.