Reference for Chullin 188:20

ואי במקום שמכריזין אי איתא דהוה טרפה אכרוזי הוו מכרזי

is merely a precautionary measure lest he sell it to the gentile in the presence of another Israelite.<span class="x" onmousemove="('comment',' Who, on seeing the gentile receiving it from the Jew and not knowing that it is trefah, would permit himself to buy it from the gentile. In the first clause, however, we do not apprehend this, for there it refers to a private transaction, where a Jew sends a thigh to the gentile, and it is not likely that any other Jew would know of this; hence there is no reasonable ground for imposing a precautionary measure. On the other hand, the Tanna of our Mishnah does feel the necessity for such a measure. V. Rashi.');">⁹</span>

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