DEUT1462 The Rabbis taught: Whence is it derived that grain is not struck where it is the practice to heap it, and that is not heaped where it is the practice to strike it? From: "a whole measure." And whence is it derived that if one said, in a place where it is generally heaped: I shall strike it and deduct from the price; or in a place where it is generally stricken: I shall heap it and add to the price -- whence is it derived that he is not heeded? From: "a whole and just measure shall there be unto you" (Bava Bathra 89b)