Reference for Avodah Zarah 122:9
רב יהודה אמר זעירי להקל והכי קאמר ת"ק כשם שברשותו אסור כך ברשות עובד כוכבים אחר נמי אסור וחיישינן לגומלין
Rav Judah said in the name of Ze'iri: He made it lenient. And this is what the first Tanna said: Just as [the wine] in his (the non-Jew’s) domain is prohibited, so too it is prohibited in the domain of any other non-Jew and we are concerned about collusion.\
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