Numbers 19:17-18

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

18And a clean person shall take hyssop and dip it in the water, and sprinkle it on the tent, on all the furnishings, on the persons who were there, and on the one who touched the bone or the one who was killed or the one who died naturally, or the grave.