15. Every open vessel, which has no covering tied down on it, shall be unclean.
16. Also, anyone who in the open field touches one who has been slain with a sword or who has died naturally, 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 burnt purification from sin and flowing water shall be added to them in a vessel.