Commentary for Pesachim 13:4

אמר רב אחא בר יעקב הכא בתלמיד יושב לפני רבו עסקינן ונזכר שיש עיסה מגולגלת בתוך ביתו ומתיירא שמא תחמיץ קדים ומבטיל ליה מיקמי דתחמיץ

- Said R'Aha B'Jacob: We treat here of a disciple sitting before his master, and he recollects that he has a rolled dough<span class="x" onmousemove="('comment',' I.e., a dough kneaded but not baked. He cannot leave the Beth Hamidrash to attend to it out of respect to his Master.');">⁷</span> at home and fears that it may turn leaven; [therefore] he anticipates and annuls it before it turns leaven. This may be proved too: for it states, 'If he is sitting in the Beth Hamidrash'.<span class="x" onmousemove="('comment',' If it is already leaven, what does it matter where he is; even if he were at home he could do nothing else?');">⁸</span>

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