Musar for Bava Batra 176:1
וחייב להכריע לו טפח היה שוקל לו עין בעין נותן לו גירומין אחד לעשרה בלח ואחד לעשרים ביבש
AND [A SHOPKEEPER] MUST ALLOW [THE PROVISION SCALE] TO SINK A HANDBREADTH [LOWER THAN THE SCALE OF THE WEIGHTS].<span class="x" onmousemove="('comment',' I.e., overweight must be allowed to the customer. ');"><sup>1</sup></span> [IF] HE GAVE HIM THE EXACT WEIGHT<span class="x" onmousemove="('comment',' Where it is not the usage to allow overweight. ');"><sup>2</sup></span> HE MUST ALLOW HIM THE [FOLLOWING] ADDITIONS,<span class="x" onmousemove="('comment',' [H] (from [H], 'to drag along'), surplus weight or measure which in certain localities shopkeepers allow to their customers. ');"><sup>3</sup></span>
Mesilat Yesharim
Our Sages of blessed memory also said: "stealing from another person is worse than stealing from Temple property, for in the former, the word 'sin' precedes the word 'betrayal' [and the opposite in the latter]..."
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Mesilat Yesharim
I will not speak with respect to deception in the area of measurements for scripture explicitly states: "the abomination of the L-rd your G-d are all who do these" (Devarim 25:16). They further stated: "the punishment for dishonest weights and measures is worse than the punishment for illicit relations" (Bava Basra 88b) and "a wholesale dealer must wipe his measures clean once in thirty days..." (ibid 88a). Why all this? So that they do not unknowingly diminish in measure and he is not punished [for stealing from his customers due to negligence].
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