פירוש על עבודה זרה 68:4

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.