Commento su Kelim 16:1
כָּל כְּלִי עֵץ שֶׁנֶּחֱלַק לִשְׁנַיִם, טָהוֹר, חוּץ מִשֻּׁלְחָן הַכָּפוּל, וְתַמְחוּי הַמִּזְנוֹן, וְהָאֱפִיפוֹרִין שֶׁל בַּעֲלֵי הַבָּיִת. רַבִּי יְהוּדָה אוֹמֵר, אַף הַמָּגֵס, וְקוֹד הַבַּבְלִי כַּיּוֹצֵא בָהֶן. כְּלֵי עֵץ, מֵאֵימָתַי מְקַבְּלִין טֻמְאָה. הַמִּטָּה וְהָעֲרִיסָה, מִשֶּׁיְּשׁוּפֵם בְּעוֹר הַדָּג. גָּמַר שֶׁלֹּא לָשׁוּף, טְמֵאָה. רַבִּי מֵאִיר אוֹמֵר, הַמִּטָּה, מִשֶּׁיְּסָרֵג בָּהּ שְׁלֹשָׁה בָתִּים:
Una nave di legno che è stata divisa in due diventa pulita, ad eccezione di un tavolo pieghevole, un piatto con scomparti per [diversi tipi di] cibo e uno sgabello da casa. Il rabbino Yehudah dice: anche un doppio piatto e un recipiente per bere babilonese sono gli stessi. Quando le navi di legno iniziano a essere sensibili all'impurità? Un letto e una culla, dopo che sono stati levigati con pelle di pesce. Se il proprietario ha deciso di non carteggiarli, sono suscettibili all'impurità. Rabbi Meir dice: un letto [diventa suscettibile all'impurità] quando lavora a maglia tre file di maglie.
Bartenura on Mishnah Kelim
English Explanation of Mishnah Kelim
Rabbi Judah says: a double dish and a Babylonian drinking vessel are subject to the same law.
When do wooden vessels begin to be susceptible to impurity?
A bed and a cot, after they are sanded with fishskin. If the owner determined not to sand them over they are susceptible to impurity. Rabbi Meir says: a bed becomes susceptible to impurity as soon as three rows of meshes have been knitted in it.
Section one: Generally, if a wooden vessel is broken into two parts it becomes clean if it was previously impure. So too, the two parts are no longer susceptible to impurity. The exceptions are wooden vessels whose pieces can still be used when the original vessel is cut into two. All of the vessels listed here can be used even when broken into two parts.
Section two: The mishnah now asks the question that it has asked with regard to vessels made of other types of material (earthenware and metal) when is the manufacture of the vessel completed such that the vessel can become impure?
For a bed and a cot to be susceptible, the wood frame must have been sanded.
However, if the owner decided to use them without sanding them, then they are susceptible even without sanding.
Beds were made by tying ropes under the frame and then tightening them to form a support (hence the phrase sleep tight!). The ropes ran the length and the breadth of the bed. According to Rabbi Meir, as soon as three rows are made in each direction, the bed is usable and is susceptible to impurity.