Then 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 whoever touched the bone, or the slain or the dead or the grave.

For when every commandment of the law had been declared by Moses to all the people, he took the blood of calves and 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 sprinkling of defiled persons with the ashes of a heifer, sanctify for the purification of the flesh,

But if we walk in the light, as he 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 kings on earth. To him who loves us and has freed us from our sins by his blood

Whiter

"Come now, let us reason together, says the LORD: though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall become like wool.

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

Then one of the elders addressed me, saying, "Who are these, clothed in white robes, and from where have they come?"

General references

And anyone who touches his bed shall wash his clothes and bathe himself in water and be unclean until the evening.

For on this day shall atonement be made for you to cleanse you. You shall be clean before the LORD from all your sins.

And the priest shall take cedarwood and hyssop and scarlet yarn, and throw them into the fire burning the heifer.