Reference for Bava Metzia 101:13

רבי יהודה אומר אין אונאה לתגר: משום שהוא תגר אין לו אונאה

and R. Eleazar said likewise, 'Well spoken!' But did we not learn, Just as the law of overreaching holds good in the case of a layman, so it holds good in the case of a merchant. Now, who is meant by 'a layman?' Surely a Private individual! — Said R. Hisda:<span class="x" onmousemove="('comment',' Other versions: R. Papa. ');">¹²</span>

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