Shabbat 156A

רבי יוסי ברבי יהודה היא. והני מילי הוא דמשני. היכי משני? אמר רב חסדא: על יד על יד.

It is the opinion of R' Yosei, son of R' Yehuda. And this leniency applies only in a case where one alters the way that he kneads. The Talmud asks: How does one alter the manner in which he kneads? Rav Ḥisda said: One does not knead the dough all at once but rather a little bit at a time.

ושוין שבוחשין את השתית בשבת ושותים זיתום המצרי. והאמרת ״אין גובלין״! לא קשיא: הא בעבה, הא ברכה. והני מילי הוא דמשני.

It was also taught: And they agree that one may mix the shatit, roasted barley to which honey is added, on Shabbat, and drink Egyptian beer, as it is not considered to be for medicinal purposes. The Talmud asks: Didn’t you say: One may not knead? That contradicts the statement that they agree that it is permitted to stir the shatit. The Talmud answers: This is not difficult, as there is a distinction between the cases. This dispute with regard to shatit is referring to mixing a thick mixture, which is similar to kneading. However, that statement where they agree that mixing is permitted is referring to a soft, thin mixture that cannot be kneaded. And all of these statements are referring to a case where one alters the way he kneads or stirs.

היכי משני? אמר רב יוסף: בחול נותן את החומץ ואחר כך נותן את השתית, בשבת נותן את השתית ואחר כך נותן את החומץ. לוי בריה דרב הונא בר חייא אשכחיה לגבלא דבי נשיה דקא גביל וספי ליה לתוריה. בטש ביה. אתא אבוה אשכחיה, אמר ליה: הכי אמר אבוה דאמך משמיה דרב, ומנו ⁠— רבי ירמיה בר אבא: גובלין ולא מספין, ודלא לקיט בלישניה ⁠— מלקיטין ליה. והני מילי הוא דמשני.

The Talmud asks: How does one alter the manner in which he performs these actions? Rav Yosef said: On a weekday one first places the vinegar in a vessel and then places the shatit. On Shabbat one first places the shatit and then places the vinegar. The Talmud relates that Levi, son of Rav Huna bar Ḥiyya, found the one who kneads in his parents’ home kneading bran on Shabbat and feeding it to his ox. He kicked him so that he would stop. When his father came and found him, he said to him: This is what your mother’s father said in the name of Rav. The Talmud interjects: And who is his mother’s father? It is R' Yirmeya bar Abba, who said: One may knead but not feed animals, and a calf that does not take the food with its tongue may be fed on Shabbat. And this applies only when one alters the manner in which he does so.