Halakhah for Bava Batra 176:4

אלא רישא במקום שנהגו וכי איתמר דר"ל אסיפא איתמר היה שוקל לו עין בעין נותן לו גירומין מנהני מילי אמר ר"ל דאמר קרא וצדק צדק משלך ותן לו וכמה גירומין א"ר אבא בר ממל אמר רב אחד מעשרה בליטרא בלח לעשרה ליטרין:

by giving of your own. If so,<span class="x" onmousemove="('comment',' That the law of adding to weights is not merely Rabbinical, but pentateuchal. ');">⁹</span> explain the next clause. [It reads]: [IF] HE GAVE HIM THE EXACT WEIGHT, HE MUST ALLOW HIM THE [FOLLOWING] ADDITIONS. Now, if giving overweight is a Pentateuchal injunction, how is [he allowed] to give him the exact weight [only]? — But, [came the reply], the earlier clause<span class="x" onmousemove="('comment',' Requiring the giving of a certain amount of overweight by allowing the provision scale to sink a handbreadth etc. ');">¹⁰</span> [is not based on a Pentateuchal injunction, but speaks] of a place where there was the practice [of giving overweight],<span class="x" onmousemove="('comment',' Wherever there exists such a practice, that clause teaches, the scale must be allowed to sink a handbreadth. ');">¹¹</span>

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