Numbers 19:15-17

Amplified Bible

¹⁵ Every open container [in the tent], which has no covering tied down on it, is unclean. ¹⁶ Also, anyone in the open field who touches one who has been killed with a sword or who has died [of natural causes], or a human bone or a grave, shall be unclean for seven days. ¹⁷ Then for the unclean person they shall take some of the ashes of the heifer burnt for the purification from sin, and running water shall be added to them in a container.