Commentary for Avodah Zarah 66:9
כסי רב אסי אסר ורב אשי שרי אי שתי בהו עובד כוכבים פעם ראשון כ"ע לא פליגי דאסור כי פליגי בפעם שני
Cups [used with wine by idolater]: R. Assi forbids, but R. Ashi permits. If an idolater drank from it the first time it was used, no one disputes that it is forbidden, they argue only if it was the second time.
Daf Shevui to Avodah Zarah
When it is first used, the cup will absorb more of the taste of the wine placed in it. That is why there is a tendency here to agree that if the first usage, or maybe even the second usage, was with forbidden wine, the it is prohibited. But if a Jew uses it the first time, or the first two times, then the cup will absorb the permitted wine. Upon further use it will no longer absorb and therefore it is permitted.
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