Numbers 19:18-20

Revised Standard Version

¹⁸ then a clean person shall take hyssop, and dip it in the water, and sprinkle it upon the tent, and upon all the furnishings, and upon the persons who were there, and upon him who touched the bone, or the slain, or the dead, or the grave; ¹⁹ and the clean person shall sprinkle upon the unclean on the third day and on the seventh day; thus on the seventh day he shall cleanse him, and he shall wash his clothes and bathe himself in water, and at evening he shall be clean.

²⁰ “But the man who is unclean and does not cleanse himself, that person shall be cut off from the midst of the assembly, since he has defiled the sanctuary of the Lord; because the water for impurity has not been thrown upon him, he is unclean.