Reference for Kelim 18:3

הַשִּׁדָּה וְהַתֵּבָה וְהַמִּגְדָּל שֶׁנִּטְּלָה אַחַת מֵרַגְלֵיהֶן, אַף עַל פִּי שֶׁמְּקַבְּלִין, טְהוֹרִין. וְשֶׁאֵינָן מְקַבְּלִין כְּדַרְכָּן, רַבִּי יוֹסֵי מְטַמֵּא. וְנַקְלִיטֵי הַמִּטָּה וַחֲמוֹר וְחִפּוּי, טְהוֹרִין. אֵין טָמֵא אֶלָּא מִטָּה וּמַלְבֵּן. וּמַלְבְּנֵי בְנֵי לֵוִי, טְהוֹרִין:

A chest, a box or a cupboard from which one of the legs was removed, even though it is still capable of holding [things], it is pure, as it cannot hold [things] in the usual manner. Rabbi Yose says: it is susceptible to impurity. The poles of a bed, its base, and [its] covering are pure. Only the bed itself and its frame are susceptible to impurity. The bed frames of the Levites are pure.

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