Yahya related to me from Malik that he had heard that Sulaymanibn Yasar said, "The fodder of the donkeys of Saad ibn Abi Waqqas ranout and so he told his slave to take some of the family's wheat andbuy barley with it, and to only take a like quantity."
USC-MSA web (English) reference: Book 31, Hadith 50
Arabic reference: Book 31, Hadith 1343