Yahya related to me from Malik from Abd al-Hamid ibn Suhayl ibnAbd ar-Rahman ibn Awf from Said ibn al-Musayyab from Abu Said al-Khudri and from Abu Hurayra that the Messenger of Allah, may Allahbless him and grant him peace, appointed a man as an agent in Khaybar,and he brought him some excellent dates. The Messenger of Allah, mayAllah bless him and grant him peace, said to him, "Are all the datesof Khaybar like this?" He said,"No. By Allah, Messenger of Allah! Wetake a sa of this kind for two sa or two sa for three." The Messengerof Allah, may Allah bless him and grant him peace, said, "Do not dothat. Sell the assorted ones for dirhams and then buy the good oneswith the dirhams."
USC-MSA web (English) reference: Book 31, Hadith 21
Arabic reference: Book 31, Hadith 1314