Commentary for Avodah Zarah 120:11
נטל חבית וזרקה [בחמתו] לבור זה היה מעשה [והכשירו]: אמר רב אשי כל שבזב טמא בעובד כוכבים עושה יין נסך כל שבזב טהור בעובד כוכבים אינו עושה יין נסך
If he took a cask and in his anger threw it into the vat — this actually happened and [the rabbis] declared it fit [for drinking]. R. Ashi said: Whatever is rendered unclean by a zav makes wine [in a similar circumstance] nesek by a non-Jew, and whatever is not rendered unclean by a zav does not makes wine nesekh by a non-Jew
Daf Shevui to Avodah Zarah
Rav Ashi tries to equate the rules governing the zav, a person with an unnatural genital discharge, with the rules governing wine touched by a non-Jew. If a zav throws something into a vat of liquid, the vat of liquid remains pure. This is a true comparison, as was noted by Rashi. The problem is that the comparison is not all that good beyond this. The main problem is that when a zav carries something, it becomes impure even if he does not touch it. But wine carried by a non-Jew is not yayin nesekh. For it to be nesekh he must touch it.
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