Reference for Bava Batra 177:5

ת"ר מנין שאין מעיינין במקום שמכריעין ואין מכריעין במקום שמעיינין ת"ל אבן שלמה

where the practice is to heap it up, and [that] it must not be heaped up<span class="x" onmousemove="('comment',' Even with the desire of the seller. ');">⁷</span> where the practice is to level it? — For it has been definitely stated, A perfect&nbsp;… measure.<span class="x" onmousemove="('comment',' Deut. XXV, 25. By deviating from the usual practice the buyer, or the seller, may be the means of defrauding, or misleading others. ');">⁸</span>

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