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Keilim2: 6
[ו] גִּסְטְרָא שֶׁנִּמְצֵאת בַּכִּבְשָׁן, עַד שֶׁלֹּא נִגְמְרָה מְלַאכְתָּהּ — טְהוֹרָה; מִשֶּׁנִּגְמְרָה מְלַאכְתָּהּ — טְמֵאָה.
טִיטְרוֹס — רַבִּי אֱלִיעֶזֶר בַּר צָדוֹק מְטַהֵר; רַבִּי יוֹסֵי מְטַמֵּא, מִפְּנֵי שֶׁהוּא כְמוֹצִיא פְרוּטוֹת.
A gistera that was found in a kiln before its manufacture was complete is tahor; after its manufacture was complete, it is tamei.
A titros: R’ Eliezer bar Tzadok rules [it] tahor; R’ Yose rules [it] tamei, since it lets out [liquid] drop by drop.
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