Shabbat 144B

בפגעין ובפרישין ובעוזרדין, אבל לא ברמונים, ושל בית מנשיא בר מנחם היו סוחטין ברמונים.

plums and quinces and crab apples. However, one may not squeeze pomegranates, because they are typically squeezed for their juice, as people from the house of Menashya bar Menaḥem would squeeze pomegranates during the week. Apparently, the Rabbis concede to R' Yehuda with regard to fruits other than pomegranates and mulberries.

וממאי דרבנן היא, דילמא רבי יהודה היא?! ותהוי נמי רבי יהודה, אימר דשמעת ליה לרבי יהודה יצאו מעצמן, סוחטין לכתחילה מי שמעת ליה?! אלא מאי אית לך למימר: כיון דלאו בני סחיטה נינהו ⁠— אפילו לכתחילה. אפילו תימא רבנן, כיון דלאו בני סחיטה נינהו ⁠— אפילו לכתחילה, שמע מינה רבנן היא. שמע מינה.

The Talmud objects: And from where is it ascertained that this baraita is in accordance with the opinion of the Rabbis? Perhaps it is in accordance with the opinion of R' Yehuda. The Talmud answers: And let this baraita also be the opinion of R' Yehuda: Say that you heard that according to R' Yehuda, juice that seeped out on its own is permitted; did you hear that squeezing it is permitted ab initio? Rather, what have you to say? Since they are not fruits that are generally designated for squeezing, it is permitted to squeeze them even ab initio. That being the case, even if you say the baraita is in accordance with the opinion of the Rabbis, the same reasoning applies: Since they are not generally designated for squeezing, it is permitted to squeeze them even ab initio. Even the Rabbis would permit squeezing fruits such as plums, quinces, and crab apples. Since the baraita does not permit squeezing pomegranates, learn from it that the baraita is in accordance with the opinion of the Rabbis. The Talmud concludes: Indeed, learn from it.

של בית מנשיא בר מנחם היו סוחטין ברמונים. אמר רב נחמן: הלכה כשל בית מנשיא בר מנחם.

It was taught in the baraita cited above that people from the house of Menashya bar Menaḥem would squeeze pomegranates on weekdays. This indicates that it is typical for people to squeeze pomegranates, and therefore it is prohibited to do so on Shabbat. Rav Naḥman said: The halakha is in accordance with the practice of the people from the house of Menashya bar Menaḥem. In other words, squeezing pomegranates is considered typical, and therefore it is prohibited on Shabbat.