Reference for Avodah Zarah 30:11

מ"ט אי נימא דחשידי אשפיכות דמים ומי חשידי האמרת ומייחדין עמהן אלא משום דאתי לזבונה לעובד כוכבים

What is the reason for this (not selling to Cutheans)? If we say they are suspect of murder, are they really suspect? Did you not say one can seclude themselves with them rather it is since they will sell them to non-Jews.

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