Reference for Beitzah 5:9

אלמא כל אוכלין לרבי יהודה אוכלא דאפרת הוא

Consequently, All food according to Rabbi Yehudah is food that has broken off [and has the same status of the food it came from]. And they contrasted [this from another Mishnah]: "And further Rabbi Yehudah said:

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