Reference for Bava Metzia 75:1

והא טעמא דרבי יוסי משום הפסד הרמאי הוא אלא תרוייהו לרבנן איצטריך ולא זו אף זו קתני:

But R. Jose's reason is that the deceiver may suffer loss!<span class="x" onmousemove="('comment',' And that obviously applies to both cases equally: how then could it be argued that if the second clause alone were taught, I might think that he agrees with the Rabbis in the first? ');">¹</span>

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