Commentary for Pesachim 78:16

אמר מר זוטרא לא לימחי איניש קדרא בקמחא דאבישנא דילמא לא בשיל שפיר ואתי לידי חימוץ אמר רב יוסף לא ליחלוט איניש

TO THE BATHS,<span class="x" onmousemove="('comment',' A bran paste was used as a depilatory or cosmetic.');">²¹</span> BUT SHE MAY RUB IT ON HER SKIN. AND A MAN MAY NOT CHEW WHEAT AND PLACE IT ON HIS WOUND, BECAUSE IT TURNS LEAVEN. <big><b>GEMARA: </b></big>Our Rabbis taught: These are the things which cannot come to fermentation: That which is baked,<span class="x" onmousemove="('comment',' Once unleavened bread is baked it can never turn leaven.');">²²</span> boiled, and that which is scalded, having been scalded in boiling water.' That which is boiled'? But while it is being boiled it turns leaven! - Said R'Papa: He means: baked [mazzah] which was [then] boiled. It was taught. R'Jose B'R'Judah said: Flour into which there fell a dripping [of water]. even all day, does not come to fermentation.<span class="x" onmousemove="('comment',' The incessant dripping prevents fermentation.');">²³</span> Said R'Papa: Provided that it acted drop after drop.<span class="x" onmousemove="('comment',' Without an appreciable interval between them.');">²⁴</span> The School of R'Shila said: Wattika<span class="x" onmousemove="('comment',' Name of a certain pastry or tart made of flour.');">²⁵</span> is permitted. But it was taught: Wattika is forbidden? - There is no difficulty: here it is suc as is prepared with oil and salt;<span class="x" onmousemove="('comment',' Oil does not cause fermentation.');">²⁶</span> there it is prepared with water and salt.<span class="x" onmousemove="('comment',' Then it is forbidden.');">²⁷</span> Mar Zutra said: A man must not line a pot with flour of roast grain, lest it had not been properly baked<span class="x" onmousemove="('comment',' Lit., 'boiled'.');">²⁸</span> and it comes to leaven.<span class="x" onmousemove="('comment',' Though roast grain is baked, and therefore can never become leaven, yet we fear that it may not have been fully baked, and when the dish is put into the pot with the water this flour will ferment.');">²⁹</span> R'Joseph said: A man must not scald

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