Mishnayos Tevul Yom Perek 4 Mishnah 3
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טבול יום פרק ד׳ משנה ג׳
3
A trough which is a tevulat yom, one may knead dough in it and cut off the portion for hallah and bring it near and call it by name [as hallah]; for it [the trough] has third degree uncleanness and third degree uncleanness is clean in hullin.
עֲרֵבָה שֶׁהִיא טְבוּלַת יוֹם, לָשִׁין בָּהּ אֶת הָעִסָּה וְקוֹצִין מִמֶּנָּה חַלָּה, וּמַקֶּפֶת וְקוֹרִין לָהּ שֵׁם, מִפְּנֵי שֶׁהִיא שְׁלִישִׁי, וְהַשְּׁלִישִׁי טָהוֹר לְחֻלִּין:
ג׳
Bartenura
לשין בה את העיסה. לעיל אשמועינן טבול יום באדם, והכא אשמועינן טבול יום בכלי. דלא תימא בעריבה אסור דלמא אתי לאחלופי בטמאה:
לשין בה את העיסה – above (i.e., in the previous Mishnayot) we are teaching about a person who had immersed himself that day, but here we are teaching about a vessel that was immersed that day, so that you would not say that a kneading trough was prohibited for perhaps you might exchange it/switch it for a ritually impure/defiled one.