תַּנּוּר גָּדוֹל שְׁיָרָיו אַרְבָּעָה טְפָחִים וְהַקָּטָן שְׁיָרָיו רֻבּוֹ. כֵּיצַד. אִם נִשְׁבַּר בַּגָּדוֹל אַרְבָּעָה וּבַקָּטָן רֻבּוֹ מְקַבֵּל טֻמְאָה פָּחוֹת מִכָּאן אֵינוֹ מְקַבֵּל טֻמְאָה. וְכֵן אִם נִטְמָא וְנִתְּצוֹ עַד שֶׁשִּׁיֵּר בּוֹ פָּחוֹת מֵאַרְבָּעָה בַּגָּדוֹל אוֹ בְּפָחוֹת מֵרֹב בַּקָּטָן טָהוֹר. נִשְׁאַר בּוֹ אַרְבָּעָה אוֹ רֹב בַּקָּטָן עֲדַיִן הוּא בְּטֻמְאָתוֹ. וְהַכִּירָה שְׁיָרֶיהָ שָׁלֹשׁ אֶצְבָּעוֹת. הַכֻּפָּח שֶׁעֲשָׂאָהוּ לַאֲפִיָּה שִׁעוּרוֹ כְּתַנּוּר. לְבִשּׁוּל שִׁעוּרוֹ כְּכִירָה:
The remnants of a larger oven are four handbreadths. The remnants of a small oven are its larger portion. What is implied? If a large oven is broken, as long as four handbreadths remain, it is susceptible to impurity. And if a small oven is broken, as long as its larger portion remains, it is susceptible to impurity. Similarly, if a large oven contracted impurity and it was smashed to the extent that less than four handbreaths remain, it is pure. A small oven becomes pure when less than its larger portion remains. If more than four handbreadths of a large oven remain or the larger portion of a small oven, it remains impure. The remnants of a range with two openings are three handbreadths. For a range with one opening: If it was made for baking, the measure is the same as that of an oven. If it was made for cooking, the measure is the same as that of a range.
