Commentary for Kelim 5:4
תַּנּוּר שֶׁהֻסַּק מֵאֲחוֹרָיו, אוֹ שֶׁהֻסַּק שֶׁלֹּא לְדַעְתּוֹ, אוֹ שֶׁהֻסַּק בְּבֵית הָאֻמָּן, טָמֵא. מַעֲשֶׂה שֶׁנָּפְלָה דְלֵקָה בְתַנּוּרֵי כְפַר סִגְנָה, וּבָא מַעֲשֶׂה לְיַבְנֶה, וְטִמְּאָן רַבָּן גַּמְלִיאֵל:
An oven that was heated from its outside, or that was that was heated without intent to complete it, or that was heated [while still] in the craftsman's house, is susceptible to impurity. There was a story that a fire fell on the ovens of Kfar Signa, and the story came to Yavneh, and Raban Gamliel ruled them susceptible to impurity.
Bartenura on Mishnah Kelim
תנור שהוסק מאחוריו – that the oven does not become susceptible to receive defilement until it is heated, and if it is not heated from the inside, but rather from the outside, it is considered heating.
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English Explanation of Mishnah Kelim
An oven that was heated from its outside, or one that was heated without the owner's knowledge, or one that was heated while still in the craftsman's house is susceptible to impurity. Usually an oven is heated up from the inside, with the owner's knowledge, after the craftsmen has put on the finishing touches. However, as long as the oven is heated up enough to cook sponge-cakes, the oven is susceptible to impurity.
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Bartenura on Mishnah Kelim
או הוסק שלא לדעתו – [even from the inside].
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English Explanation of Mishnah Kelim
It once happened that a fire broke out among the ovens of Kefar Signah, and when the case was brought up at Yavneh Rabban Gamaliel ruled that they were unclean. Even though these ovens were not heated up intentionally, and they were heated up probably in the craftsmen's house, they are still susceptible to impurity.
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Bartenura on Mishnah Kelim
או שהוסק בבית האומן – prior to the completion of the manufacture of its being made.
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Bartenura on Mishnah Kelim
טמא – we have the reading. But there are books that we have the reading, that it is pure, and this is a blunder/confusion.
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