Musar 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>