Yahya related to me from Malik from Amr ibn Yahya al-Mazini thathis father said that he had heard Abu Said al-Khudri say that theMessenger of Allah, may Allah bless him and grant him peace, said,"There is no zakat on less than five camels, there is no zakat on lessthan five awaq (two hundred dirhams of pure silver) and there is nozakat on less than five awsuq (three hundred sa)."
USC-MSA web (English) reference: Book 17, Hadith 1
Arabic reference: Book 17, Hadith 581