Mishnayos Eduyos Perek 1 Mishnah 14

כלי חרס מציל על הכל – an earthenware utensil that is surrounded by something closely covered with a lid protects everything that is inside it when it is the tent of a dead person, and will not defile anything that is inside it, as it is written (Numbers 19:15): “And every open vessel, with no lid fastened down, shall be unclean,” but if it has a lid fastened down, it is pure and what is inside it, it does not matter whether it is utensils, or food-stuffs or drink. And the Biblical verse is speaking about an earthenware vessel, as it is written, “And every open vessel,” concerning that which defiles through its opening, and does not defile through its back.

אינו מציל אלא על אוכלין ומשקין ועל כלי חרס – but on other kinds of utensils, it does not protect as will be explained further on.

מפני מה וכו' מפני שהוא טמא על גב עם הארץ – for everything that is found with the ignoramuses whether utensils, food-stuffs and liquids/drink, all are considered impure, because they are not expert in the laws of the impurity and purity and consider that which is impure to be pure.

ואין כלי טמא חוצץ – it does not offer protection against the defilement other than only a pure utensil, but an impure utensil cannot protect on what is inside of it, and these utensils belonging to the ignoramuses are considered to be ritually impure and do not offer protection.

לעצמו טיהרנו – to the ignoramus himself we have declared it pure, and we should not suspect that perhaps a Haver/ a member of the order for the observance of Levitical laws in daily intercourse, would come to use them, for they are separated from contact with them and without this, also, all of their food would be ritually impure; therefore, food and drink and earthenware utensils which have no purity in the Mikveh, for when they were in the midst of a vessel with a lid fastened down belong to the ignoramuses, we say to them that they are ritually pure [for them], and they can use them they are the ones who consider their utensils to be considered pure, and we don’t suspect lest a Haver will borrow one from them and use them, for they are, for him, in a status of impurity and they can never have ritual purity ever. But a vessel that only requires only rinsing in order to be restored to Levitical cleanness where there is a suspicion that a Haver will borrow it from them and immerse them [in the Mikveh] and use them without sprinkling on the third and seventh day, for he will not know that they were defiled in the tent of a dead person, and would think that a mere immersion [in the Mikveh] would be sufficient to rescue it from the ritual impurity that it sustained while with the ignoramus, and that is why it is taught in our Mishnah: “You have declared it ritually clean/pure both for the ignoramus and for you,” and a Haver would come to use it. Therefore, they made the law equivalent for all and said that a vessel that requires only rinsing in order to be restored to Levitical cleanness is saved with a lid fastened down, which does not belong either to a Haver nor to an ignoramus. And if they came to make a decree that an earthenware utensil of an ignoramus shall never be saved with a lid fastened down because it is considered ritually impure and no impure vessel can protect/save it, none of the ignoramuses would accept it from them, because they would hold that they are expert and guard their utensils in ritual purity and they can protect their utensils.