Responsa for Chullin 266:3
דאמרי
Then in the case of a gentile, too, people might say that he is only buying meat, will they not? - We must suppose in this case that the gentile was sitting by the till.<span class="x" onmousemove="('comment',' This is even stronger evidence that the gentile is a partner.');"><sup>2</sup></span>
Shut min haShamayim
Regarding the third matter, they responded: "It is not common to trust a non-Jew." (Chullin 133b:4), and we should not rely on their testimony, and it has been said (Bava Batra 91b:6): "One who relies on them falls into their hands."
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