Reference for Kelim 28:4

מִטְפְּחוֹת סְפָרִים, בֵּין מְצֻיָּרוֹת בֵּין שֶׁאֵינָן מְצֻיָּרוֹת, טְמֵאוֹת, כְּדִבְרֵי בֵית שַׁמַּאי. בֵּית הִלֵּל אוֹמְרִים, מְצֻיָּרוֹת, טְהוֹרוֹת, וְשֶׁאֵינָם מְצֻיָּרוֹת, טְמֵאוֹת. רַבָּן גַּמְלִיאֵל אוֹמֵר, אֵלּוּ וָאֵלּוּ טְהוֹרוֹת:

Covers of books, whether or not they are illustrated, are [susceptible to being rendered] impure, in accordance with Beit Shammai. Beit Hillel say: those which are illustrated are pure, and those which are not illustrated are [susceptible to being rendered] impure. Rabban Gamaliel says: these and those are pure.

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