Yahya related to me from Malik from Muhammad ibn Abdullah ibn AbdarRahman ibn Abi Sasaca al-Ansari from al-Mazini from his father fromAbu Said al-Khudri that the Messenger of Allah, may Allah bless himand grant him peace, said, "There is no zakat on less than five awsuqof dates, there is no zakat on less than five awaq of silver and thereis no zakat on less than five camels."
USC-MSA web (English) reference: Book 17, Hadith 2
Arabic reference: Book 17, Hadith 582