Musnad Ahmad 27:699

Rawh narrated to us, Ibn Jurayj and Ibn Abi Dhi'b narrated to us, they said: Ibn Shihab informed us, from Salim ibn Abdullah ibn Umar, from his father, who said: "I saw the people during the time of the Messenger of Allah, peace and blessings of Allah be upon him, being struck if they traded food in bulk, [for] selling it before they moved it to their own dwellings."