Reference 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.

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