נֶסֶר שֶׁהוּא נָתוּן עַל פִּי תַנּוּר חָדָשׁ וְעוֹדֵף מִכָּל צְדָדָיו בְּפוֹתֵחַ טֶפַח, טֻמְאָה תַחְתָּיו, כֵּלִים שֶׁעַל גַּבָּיו טְהוֹרִים. טֻמְאָה עַל גַּבָּיו, כֵּלִים שֶׁתַּחְתָּיו טְהוֹרִים. וּבְיָשָׁן, טָמֵא. רַבִּי יוֹחָנָן בֶּן נוּרִי מְטַהֵר. נָתוּן עַל פִּי שְׁנֵי תַנּוּרִים, טֻמְאָה בֵינֵיהֶם, הֵם טְמֵאִים. רַבִּי יוֹחָנָן בֶּן נוּרִי מְטַהֵר:
Si une planche a été placée au-dessus de l'ouverture d'un nouveau four et qu'elle s'étend de tous les côtés par l'espace d'une largeur de main, s'il y avait des impuretés en dessous, les vaisseaux qui se trouvent au-dessus restent purs. S'il y avait des impuretés dessus, les vaisseaux en dessous restent purs. Si c'était un vieux [four], ils sont impurs. Le rabbin Yochanan ben Nuri les déclare purs. S'il était placé à travers la bouche de deux fours et qu'il y avait de l'impureté entre eux, ils sont impurs, mais le rabbin Yochanan ben Nuri les déclare purs.
Mishnah Kelim
A baking oven originally must be no less than four handbreadths [high] and what is left of it four handbreadths, the words of Rabbi Meir. But the sages say: this applies only to a large oven but in the case of a small one it originally can be [any height] and what is left is the greater part of it. [Its susceptibility to impurity begins] as soon as its manufacture is completed. What is regarded as the completion of its manufacture? When it is heated to a degree that suffices for the baking of spongy cakes. Rabbi Judah says: when a new oven has been heated to a degree that sufficed for the baking of spongy cakes in an old one.
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Mishnah Kelim
An old oven was within a new one and netting was over the mouth of the old [new] one: If [it was placed such that if] the old one were to be removed the netting would drop, all [the contents of both ovens] are unclean; But if it would not drop, all are clean. A new oven was within an old one and netting was over the mouth of the old one if there was not a handbreadth of space between the new oven and the netting, all the contents of the new one are clean.
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