Reference for Tahorot 7:1
הַקַּדָּר שֶׁהִנִּיחַ אֶת קְדֵרוֹתָיו וְיָרַד לִשְׁתּוֹת, הַפְּנִימִיּוֹת טְהוֹרוֹת, וְהַחִיצוֹנוֹת טְמֵאוֹת. אָמַר רַבִּי יוֹסֵי, בַּמֶּה דְבָרִים אֲמוּרִים, בְּמֻתָּרוֹת. אֲבָל בַּאֲגוּדוֹת, הַכֹּל טָהוֹר. הַמּוֹסֵר מַפְתְּחוֹ לְעַם הָאָרֶץ, הַבַּיִת טָהוֹר, שֶׁלֹּא מָסַר לוֹ אֶלָּא שְׁמִירַת הַמַּפְתֵּחַ:
A potter who left his pots and went down to drink, the inner pots are pure but the outer ones [those facing the road or public domain] are impure. Rabbi Yose says: to which cases does this apply? To unbound ones; but if they are tied together, everything is pure. One who gives over his [house] key to an <i>am ha'aretz</i> [a non-learned person, assumed to be impure], the house is pure, because he only gave over to him [the rights of] the guarding of the key.