Quotation zu Bamidbar 19:23

Introduction Finally, a mishnah whose focus is not ovens! The tenth chapter of Kelim deals with the types of vessels who remain clean if they have a tightly fitting lid. This halakhah is rooted in Numbers 19:14-15 which reads: "14 This is the ritual: When a person dies in a tent, whoever enters the tent and whoever is in the tent shall be unclean seven days; 15 and every open vessel, with no lid fastened down, shall be unclean."