Talmud Bavli
Talmud Bavli

Halakhah for Bava Batra 176:5

אחד לעשרה בלח ואחד לעשרים ביבש וכו': איבעיא להו היכי קאמר אחד מעשרה בלח לעשרה דלח ואחד מעשרים ביבש לעשרים דיבש או דלמא אחד מעשרה לעשרה דלח ולעשרים דיבש תיקו

and the statement of Resh Lakish has been made with reference to [what has been said, not in the earlier, but in] the latter clause, which reads, [IF] HE GAVE HIM THE EXACT WEIGHT, HE MUST ALLOW HIM THE [FOLLOWING] ADDITIONS [and with reference to this it has been asked], 'Whence [is] this law'? — [And] Resh Lakish said: Scripture says: and just,<span class="x" onmousemove="('comment',' Deut. ibid. ');"><sup>12</sup></span> [which means], make [your weight] just, by giving him of your own. And how much must be added to the weight? — R. Abba b. Memel said in the name of Rab: In [the case of] liquids, a tenth of a pound<span class="x" onmousemove="('comment',' Heb. litra, [G], the Roman libra. ');"><sup>13</sup></span> for [every] ten pounds.<span class="x" onmousemove="('comment',' V. infra. ');"><sup>14</sup></span>

Kitzur Shulchan Arukh

You should measure and weigh generously. [That is,] you should give more than the exact quantity as it is said:7Deuteronomy 25: 15. "You must have a full, just measure." What does the word "just" imply? Says the Torah: "Be just by giving him some of your own."8Bava Basra 88b. Rashi explains the apparent redundancy in the phrase “a full just measure” (a full measure is by definition, a just one) stating “although you give a full measure, make it tzedek, just and honest, by adding to it a little of your own; weigh generously, tilt the scale in the customer’s favor.”
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