Shabbat 74B

דשלקי ליה שבעא זימני, ואי לא שקלי ליה מסרח ⁠— וכפסולת מתוך אוכל דמי.

as they are boiled 7 times. And, if one does not remove them from the shells, they rot. Therefore, it is considered like removing waste from food. The rotting edible portion of the lupine causes the shell to reek. Removing the edible portion, therefore, has the legal status of removing waste.

והטוחן. אמר רב פפא: האי מאן דפרים סילקא ⁠— חייב משום טוחן. אמר רב מנשה: האי מאן דסלית סילתי ⁠— חייב משום טוחן. אמר רב אשי: אי קפיד אמשחתא ⁠— חייב משום מחתך.

We learned in the Mishnah, among those liable for performing primary categories of labor: And one who grinds. Rav Pappa said: One who chops beets into small pieces on Shabbat is liable due to the prohibited labor of grinding, as the actions are similar. Rav Menashe said: One who chops wood chips for sawdust (Rambam) is liable due to the prohibited labor of grinding. Rav Ashi said: If he is particular in his chopping with regard to the measurement, i.e., he is careful to cut all the chips to a particular size, he is also liable due to the labor of cutting.

והלש והאופה. אמר רב פפא: שבק תנא דידן בישול סממנין דהוה במשכן ונקט אופה?! תנא דידן סידורא דפת נקט.

We learned in the Mishnah, among those liable for performing primary categories of labor: And one who kneads and one who bakes. Rav Pappa said: Our tanna left out the labor of cooking the spices for dye, which was performed in the Tabernacle, and included the labor of baking, which was not performed in the construction of the Tabernacle. If, as stated above, all the primary categories of labor were derived from the labors in the Tabernacle, why did the tanna omit cooking? The Talmud answers: Our tanna cited the sequence of preparing bread, which was the underlying principle behind his organization of the primary categories of labor. He opened with plowing and concluded with the preparation of bread.