What did Allah's Apostle (saw) instruct people to do if they bought foodstuff without weighing or measuring it and then sold it at the same place?
 Narrated `Abdullah bin `Umar:                     Those people who used to buy foodstuff at random (without weighing or measuring it) were beaten in the lifetime of Allah's Apostle if they sold it at the very place where they had bought it, till they carried it to their dwelling places.