Related for Pesachim 83:17
זה הכלל כל שהוא ממין דגן הרי זה עובר בפסח הרי אלו באזהרה ואין בהן משום כרת:
<big><b>MISHNAH: </b></big>NOW THE FOLLOWING [THINGS] MUST BE REMOVED<span class="x" onmousemove="('comment',' I.e., they must not be used; lit., 'they must pass away' (R. Tam. and Jast.) . Rashi: (On account of) the following things you transgress the injunctions, (leaven) 'shall not be seen' and (leaven) 'shall not be found' (in the house) .');"><sup>20</sup></span> ON PASSOVER: BABYLONIAN KUTAH,<span class="x" onmousemove="('comment',' V. supra p. 95, nn. 7 and 8.');"><sup>21</sup></span>
Tosefta Pesachim
Water that was used by bakers may be poured out in a level place, but it may not be poured out in a place with a downward slope (קטפרוס) because it gathers together and becomes leavened.
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