Numbers 19:18-20 World English Bible (WEB)
18 A clean person shall take hyssop, dip it in the water, and sprinkle it on the tent, on all the vessels, on the persons who were there, and on him who touched the bone, or the slain, or the dead, or the grave. 19 The clean person shall sprinkle on the unclean on the third day, and on the seventh day. On the seventh day, he shall purify him. He shall wash his clothes and bathe himself in water, and shall be clean at evening. 20 But the man who shall be unclean, and shall not purify himself, that soul shall be cut off from among the assembly, because he has defiled the sanctuary of Yahweh. The water for impurity has not been sprinkled on him. He is unclean.