Quoting%20commentary for Bava Metzia 101:20

איתמר האומר לחבירו על מנת שאין לך עלי אונאה רב אמר יש לו עליו אונאה ושמואל אמר אין לו עליו אונאה לימא רב דאמר כרבי מאיר ושמואל דאמר כרבי יהודה

only if the purchaser was defrauded; how do I know it if the vendor was overreached? Because Scripture states,'…acquirest…ye shall not deceive' — Now, both vendee and vendor must be written, for had the Divine Law stated [the law only of] the vendor — that is because he knows his purchase;<span class="x" onmousemove="('comment',' Hence, if he overreaches, he does it wantonly. and therefore the overcharge is returnable. ');">¹⁷</span>

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