Numbers 19:18-21

18A 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. 19Then the clean person 1shall sprinkle on the unclean on the third day and on the seventh day; and on the seventh day he shall purify him from uncleanness, and he shall wash his clothes and bathe himself in water and shall be clean by evening.

20‘But the man who is unclean and does not purify himself from uncleanness, that person shall be cut off from the midst of the assembly, because he has 2defiled the sanctuary of the Lord; the water for impurity has not been sprinkled on him, he is unclean. 21So it shall be a perpetual statute for them. And he 3who sprinkles the water for impurity shall wash his clothes, and he who touches the water for impurity shall be unclean until evening.