Numbers 19:17-19

17Then for the unclean person they shall take some of the 1ashes of the 2burnt 34purification from sin and 5flowing water shall be 6added to them in a vessel. 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 7shall 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.