כַּמָּה שִׁעוּר הַבֶּגֶד לְהִתְטַמֵּא שְׁלֹשָׁה טְפָחִים עַל שְׁלֹשָׁה טְפָחִים לְמִדְרָס. וְשָׁלֹשׁ אֶצְבָּעוֹת עַל שָׁלֹשׁ אֶצְבָּעוֹת מְכֻוָּנוֹת עִם הַמֶּלֶל לְטֻמְאַת הַמֵּת אוֹ לִשְׁאָר טֻמְאוֹת. בַּמֶּה דְּבָרִים אֲמוּרִים בְּבִגְדֵי צֶמֶר וּפִשְׁתִּים. אֲבָל בְּגָדִים שֶׁל שְׁאָר מִינִין אֵין מְקַבְּלִין טֻמְאָה מִכָּל הַטֻּמְאוֹת אֶלָּא אִם כֵּן הָיָה בָּהֶן שְׁלֹשָׁה טְפָחִים עַל שְׁלֹשָׁה טְפָחִים אוֹ יֶתֶר. שֶׁנֶּאֱמַר (ויקרא יא לב) "אוֹ בֶגֶד" מִפִּי הַשְּׁמוּעָה לָמְדוּ שֶׁבָּא הַכָּתוּב לְרַבּוֹת שְׁלֹשָׁה טְפָחִים עַל שְׁלֹשָׁה טְפָחִים כִּשְׁאָר בְּגָדִים לַטֻּמְאָה. בַּמֶּה דְּבָרִים אֲמוּרִים בִּקְרָעִים מִן הַבְּגָדִים. אֲבָל הָאוֹרֵג בֶּגֶד בִּפְנֵי עַצְמוֹ כָּל שֶׁהוּא הֲרֵי זֶה מְקַבֵּל שְׁאָר טֻמְאוֹת חוּץ מִטֻּמְאַת מִדְרָס שֶׁאֵין מְקַבֵּל אוֹתָהּ אֶלָּא הָרָאוּי לְמִדְרָס:
What is the minimum measure for a cloth to contract impurity? Three handbreadths by three handbreadths to contract the impurity of a support for a zav, precisely three fingerbreadths by three fingerbreadths together with the loose hanging strands to contract the impurity stemming from a human corpse or other types of impurity. With regard to what does the above apply? To clothes of wool or flax. If, however, clothes were made from other fabrics, they do not contract any type of impurity unless they are three handbreadths by three handbreadths. This is derived from Leviticus 11:32 which states: "or a garment." According to the Oral Tradition, it was taught that "or" serves as an inclusion, teaching that a garment three handbreadths by three handbreadths from other fabrics is susceptible to impurity. When does the above apply? With regard to torn pieces from a garment. When, however, one weaves a garment independently, it is susceptible to any impurity no matter how small it is, with the exception of the impurity of a support for a zav to which only those articles fit to serve as a support are susceptible.
