Commentary for Avodah Zarah 122:2
המטהר יינו של עובד כוכבים ברשותו וישראל דר באותה חצר מותר והוא שמפתח וחותם בידו א"ל רבי יוחנן לתנא תני אע"פ שאין מפתח וחותם בידו מותר
If [a Jew] prepares the wine of a non-Jew in a state of ritual purity in his (the non-Jew’s) domain and a Jew resides in that courtyard, it is permitted should the key and seal be in his possession. R. Yohanan said to the tanna: Read [as follows]: Even though the key and seal are not in his possession it is permitted.
Daf Shevui to Avodah Zarah
In this case, the wine belongs to the non-Jew and the Jew is simply producing it. Here it is even more likely that the non-Jew would touch the wine, because, after all, it is his wine. In this case, the Jew must have the key and seal even if another Jew lives in the courtyard. Since the wine belongs to the non-Jew, it would not be inappropriate for him to try some. The only reason he would not is that he does not have access.
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Daf Shevui to Avodah Zarah
R. Yohanan emends the baraita. Since a Jew resides in the courtyard, the other Jew does not have to possess the key and seal for it to be permitted. If the non-Jew drinks, the Jew will see and tell the other Jew.
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