Reference for Chullin 188:18

אחד מפני האנסין

R'Ashi answered: The whole [Baraitha] deals with a place where they do not proclaim it;<span class="x" onmousemove="('comment',' So that generally Jews would not buy meat from gentiles for they are supplied with trefah meat and no announcement is made of this fact.');">⁷</span>

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