Commentary for Avodah Zarah 93:20
ומי מיתסרי והא א"ר יוחנן משום ר"ש בן יהוצדק מים של רבים אין נאסרין לא צריכא דקא נבעי מארעא:
But is [water which has been worshipped] prohibited; for has not R. Yohanan said in the name of R. Shimon b. Yehotzadak: Water which belongs to the public is not prohibited [if an individual worshipped it]! No, it was necessary [to ask the question] where it is water which wells up from the earth.
Daf Shevui to Avodah Zarah
Water which belongs to the public cannot become prohibited. So his question must refer to water that bubbles up from the ground on the property of a private person. While the Talmud does not say so, there is no answer to this question either. This is the end of this series of highly theoretical and abstract questions. I thought they were quite interesting and served as a window to the thinking of late amoraim.
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