Commentary 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,12 [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 pound13 for [every] ten pounds.14

Tosafot on Bava Batra

But here there is no possibility of repentance. And this is said specifically regrading the sexual sins that lead to no mamzer, but one who has intercourse with a married woman and gives birth from her, or from one of the other forbidden close relations, this is "a crooked thing cannot be made straight" (Eccl. 1:15) as it is said (Yevamot 21a) regarding teshuvah 'and behold Rabbi Chayim says that even though what is crooked cannot be made straight it is possible to do teshuvah as commanded by God, Who has commanded him to do teshuvah and sincerely repent, but a robber, whose teshuvah is dependent on returning what was stolen, as it is written "and he returns what he stole, etc." (Lev. 5:23), how can one who stole from the public know exactly from whom he has stolen to return [the property]? And even though it is said 'let him pay with [the stolen goods] the needs of the community' (Baba Kamma 94b) in any instance it is not complete teshuvah.

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