Reference for Chullin 187:49

כיון שראתה אמו עלתה לגג ונפלה ומתה אף הוא עלה לגג ונפל ומת

first because he is deceiving him,<span class="x" onmousemove="('comment',' For a gentile when buying meat of a Jew believes that he is buying the meat of an animal that has been ritually slaughtered, and it is forbidden to take advantage of his ignorance and to pass on to him trefah meat.');">²¹</span>

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