Beitzah 17A

היינו קלקולא. אמר רבא אמר רב חסדא אמר רב הונא: הלכה כרבי, ולאסור.

this is the corruption that might result from a ruling that renders it prohibited to prepare an eiruv the day before. Therefore, this cannot serve as proof of the conclusive ruling. Rava said that Rav Ḥisda said that Rav Huna said: The halakha is in accordance with the opinion of R' Yehuda HaNasi to prohibit one from preparing either type of eiruv. One may not prepare an eiruv either for courtyards or for boundaries, as the halakha is in accordance with R' Elazar’s version of the opinion of R' Yehuda HaNasi.

תנו רבנן: יום טוב שחל להיות בשבת, בית שמאי אומרים: מתפלל שמנה, [ואומר] של שבת בפני עצמה, ושל יום טוב בפני עצמה. ובית הלל אומרים: מתפלל שבע, מתחיל בשל שבת ומסיים בשל שבת, ואומר קדושת היום באמצע. רבי אומר, אף חותם בה: ״מקדש השבת, ישראל והזמנים״.

§ A baraita states the following baraita: In the case of a Festival that occurs on Shabbat, Beit Shammai say: One must recite an Amida prayer that includes 8 blessings, inserting two additional blessings between the standard opening 3 and concluding 3. As for the two middle blessings, one recites one for Shabbat as an independent blessing and a second for the Festival as an independent blessing. And Beit Hillel say: One must pray an Amida comprising only 7 blessings, i.e., the 3 opening ones, the 3 concluding ones, and one in between. One begins the middle blessing with Shabbat and concludes it with Shabbat, and he recites a passage referring to the sanctity of the day of the Festival in the middle. R' Yehuda HaNasi says: He even concludes this blessing with mention of both Shabbat and the Festival, saying: Who sanctifies Shabbat, the Jewish people, and the seasons.

תני תנא קמיה דרבינא: ״מקדש ישראל והשבת והזמנים״. אמר ליה: אטו שבת ישראל מקדשי ליה? והא שבת מקדשא וקיימא. אלא אימא: ״מקדש השבת, ישראל והזמנים״. אמר רב יוסף: הלכה כרבי, וכדתריץ רבינא.

A tanna taught a baraita before Ravina with a slightly different reading: He concludes the blessing with: Who sanctifies the Jewish people, Shabbat, and the seasons. Ravina said to that tanna: Is that to say that the Jewish people sanctify Shabbat? Isn’t Shabbat already sanctified from the 6 days of Creation? Every 7th day is automatically Shabbat, without the need for any declaration on the part of the Jewish people. Rather, amend it and say as follows: Who sanctifies Shabbat, the Jewish people, and the seasons, as the Jewish people indeed sanctify Rosh Chodesh and the Festival days. Rav Yosef said: The halakha with regard to the conclusion of the blessing is in accordance with the opinion of R' Yehuda HaNasi and as the difficulty was resolved by Ravina.