Numbers 19:17-18

17For the purification of the unclean person, take some of the ashes of the burnt sin offering, put them in a jar, and pour fresh water1 over them. 18Then a man who is ceremonially clean is to take some hyssop, dip it in the water, and sprinkle the tent, all the furnishings, and the people who were there. He is also to sprinkle the one who touched a bone, a grave, or a person who has died or been slain.