Commentary for Shabbat 74:3
אמר רב ששת אמר ר' יוחנן כירה שהסיקוה בגפת ובעצים משהין עליה חמין שלא הוחמו כל צורכן ותבשיל שלא בישל כל צורכו עקר לא יחזיר עד שיגרוף או עד שיתן אפר קסבר מתניתין להחזיר תנן אבל לשהות משהין אע"פ שאינו גרוף ואינו קטום
Rabbah b. Bar Hanah said in R. Johanan's name: If he covered it with ashes, yet it blazed up again; one may keep upon it hot water, if that has been heated all it needs, or a dish which has been boiled all it needs, even if they are coals of broom.<span class="x" onmousemove="('comment',' Rothem is a species of broom growing in the desert (Jast.), which retains its heat longer than other coals and is slower to go out. ');"><sup>5</sup></span> Then this proves that when it shrinks and is improved thereby it is permitted? — [No.] Here it is different, because he covered it with ashes. If so, why state it? It is necessary [to state it where] it blazed up again. Then it is identical with the first [dictum]? — It is necessary [to state it] of coals of broom.
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