Narrated to us Ibn Abi 'Umar: Narrated to us Sufyan, from Ayyub, from Muhammad, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "Whoever buys a sheep that has been left unmilked (to deceive the buyer) has the choice of two options: if he wishes, he may keep it, and if he wishes, he may return it along with a sa' of dates, not of the best quality."