Mishnah for Oholot 5:4
לָגִין שֶׁהוּא מָלֵא מַשְׁקִין טְהוֹרִין, הַלָּגִין טָמֵא טֻמְאַת שִׁבְעָה, וְהַמַּשְׁקִין טְהוֹרִין. וְאִם פִּנָּן בִּכְלִי אַחֵר, טְמֵאִין. הָאִשָּׁה שֶׁהִיא לָשָׁה בָעֲרֵבָה, הָאִשָּׁה וְהָעֲרֵבָה טְמֵאִים טֻמְאַת שִׁבְעָה, וְהַבָּצֵק טָהוֹר. וְאִם פִּנַּתּוּ לִכְלִי אַחֵר, טָמֵא. חָזְרוּ בֵית הִלֵּל לְהוֹרוֹת כְּדִבְרֵי בֵית שַׁמָּאי:
A flagon that is full of pure liquid, the flagon becomes impure for seven days but the liquid is pure. But if one emptied [the liquids out into another vessel, they are impure. A woman who was kneading in a trough, the woman and the trough become impure for seven days but the dough is pure. But if one emptied the dough out into another vessel, it is impure. Beit Hillel later retracted to rule like Beit Shammai.
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