כלים י׳Kelim 10

Mishnah 1א׳

אֵלּוּ כֵלִים מַצִּילִין בְּצָמִיד פָּתִיל, כְּלֵי גְלָלִים, כְּלֵי אֲבָנִים, כְּלֵי אֲדָמָה, כְּלֵי חֶרֶס, וּכְלֵי נֶתֶר, עַצְמוֹת הַדָּג וְעוֹרוֹ, עַצְמוֹת חַיָּה שֶׁבַּיָּם וְעוֹרָהּ, וּכְלֵי עֵץ הַטְּהוֹרִים. מַצִּילִים בֵּין מִפִּיהֶם בֵּין מִצִּדֵּיהֶן, בֵּין יוֹשְׁבִין עַל שׁוּלֵיהֶן בֵּין מֻטִּין עַל צִדֵּיהֶן. הָיוּ כְפוּיִים עַל פִּיהֶן, מַצִּילִים כֹּל שֶׁתַּחְתֵּיהֶן עַד הַתְּהוֹם. רַבִּי אֱלִיעֶזֶר מְטַמֵּא. עַל הַכֹּל מַצִּילִין, חוּץ מִכְּלֵי חֶרֶס, שֶׁאֵינוֹ מַצִּיל אֶלָּא עַל הָאֳכָלִים וְעַל הַמַּשְׁקִין וְעַל כְּלֵי חָרֶס:

The following vessels protect their contents when they have a tightly fitting cover: those made of cattle dung, of stone, of clay, of earthenware, of sodium carbonate, of the bones of a fish or of its skin, or of the bones of any animal of the sea or of its skin, and wooden vessels that not subject to impurity. They protect whether [the covers close] their mouths or their sides, whether they stand on their bottoms or lean on their sides. If they were turned over with their mouths downwards they afford protection to all that is beneath them to the deep. Rabbi Eliezer declares this impure. These protect everything, except that an earthen vessel protects only foods, liquids and earthen vessels.

Mishnah 2ב׳

בַּמֶּה מַקִּיפִים. בְּסִיד וּבְגִפְּסִיס, בְּזֶפֶת וּבְשַׁעֲוָה, בְּטִיט וּבְצוֹאָה, בְּחֹמֶר וּבְחַרְסִית, וּבְכָל דָּבָר הַמִּתְמָרֵחַ. אֵין מַקִּיפִים לֹא בְּבַעַץ וְלֹא בְעוֹפֶרֶת, מִפְּנֵי שֶׁהוּא פָתִיל וְאֵינוֹ צָמִיד. אֵין מַקִּיפִין לֹא בִדְבֵלָה שְׁמֵנָה, וְלֹא בְּבָצֵק שֶׁנִּלּוֹשׁ בְּמֵי פֵרוֹת, שֶׁלֹּא יְבִיאֶנּוּ לִידֵי פְסוּל. וְאִם הִקִּיף, הִצִּיל:

How do they tightly fit the cover? With lime or gypsum, pitch or wax, mud or excrement, crude clay or potter's clay, or any substance that is used for plastering. One may not make a tightly fitting cover with tin or with lead because though it is a covering, it is not tightly fitting. One may not make a tightly fitting cover with swollen fig-cakes or with dough that was kneaded with fruit juice, since it might cause it to become unfit. If he did make a tightly fitting cover [from such material] it protects.