Yahya related to me from Malik from Nafi that Sulayman ibn Yasartold him that one time the fodder of the animals of Abd ar-Rahman ibnal-Aswad ibn Abd Yaghuth was finished so he said to his slave, "Takesome of your family's wheat as food and buy with it barley, and takeonly a like quantity.' "
USC-MSA web (English) reference: Book 31, Hadith 51
Arabic reference: Book 31, Hadith 1344