Reference for Avodah Zarah 78:14
<big><strong>גמ׳</strong></big> תנינא להא דת"ר יושב ישראל בצד עדרו של עובד כוכבים ועובד כוכבים חולב לו ומביא לו ואינו חושש היכי דמי אי דליכא דבר טמא בעדרו פשיטא ואי דאיכא דבר טמא בעדרו אמאי
GEMARA. We have already taught this, as the rabbis have taught elsewhere: If an Israelite is sitting near a non-Jew's flock and the non-Jew milks and brings some to him, he need have no concern [and is allowed to drink it]. How is this to be understood? If there is no unclean animal in the flock, it is obvious; but if there is an unclean animal in the flock why [should he be permitted to drink the milk]!
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