Commentary for Avodah Zarah 68:4
ההוא ארבא דמורייסא דאתי לנמילא דעכו אותיב רבי אבא דמן עכו נטורי בהדה א"ל רבא עד האידנא מאן נטרה א"ל עד האידנא למאן ניחוש לה אי משום דמערבי ביה חמרא קיסתא דמורייס בלומא קיסתא דחמרא בד' לומי
Once a ship-load of murias came to the port of Acco. R. Aha of Acco placed a guard by it. Rava said to him: And who watched the ship till now? He replied: Until now what would we have worried about: as to mixing the brine with wine, a kista of muries costs a luma while a kista of wine costs four lumas.
Daf Shevui to Avodah Zarah
R. Aha puts guards around the murias that arrives by ship in Acco to prevent wine being put in there. He does not worry that wine has already been mixed into the murias before it arrives in Acco because in the region from which the wine comes, wine costs four times as much as murias, and therefore no one would mix wine in with it. And we are not worried that the murias might have come from Tyre, where wine is cheap, because shipping it from Tyre was not practical.
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