[If] the utensils are made of dung, stone, or [unbaked] clay, everything remains ta-hor. [If] the utensil is [considered] tahor for use with sanctified [food] or the parah adumah procedure, everything remains tahor, because everyone is trustworthy re-garding the parah adumah procedure. [The reason for the above rulings is] because utensils that are always tahor, and also tahor earthenware utensils, curtail [tumah when combined] with the walls of a structure.