Yahya related to me from Malik from Nafi that Abdullah ibn Umarsaid, "In the time of the Messenger of Allah, may Allah bless him andgrant him peace, we used to buy food. He sent orders for us to moveour purchases from the place in which we purchased them to anotherplace before we re-sold them."
USC-MSA web (English) reference: Book 31, Hadith 42
Arabic reference: Book 31, Hadith 1334