Related for Pesachim 83:5
בי רב אמרי לאמר לאו אמור:
Rabbi asked Bar Kappara: How does that imply it? Said he to him, Because it is written, 'lemor': a 'not' ['lo'] was stated in [these] matters.<span class="x" onmousemove="('comment',' 'Lemor' is treated as contraction of 'lo amur'. I.e., the laws contained in this section are subject to the admonition, 'do not violate them'.');"><sup>7</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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