Sahih Bukhari Volume 2, Book 24, Hadith Number 526.

Narated By Abu Sa’id Al-Khudri  : Allah’s Apostle said, “There is no Zakat on less than five camels and also there is no Zakat on less than five Awaq (of silver). (5 Awaq = 22 Fransa Riyals of Yamen or 200 Dirhams.) And there is no Zakat on less than five Awsuq. (A special measure of food-grains, and one Wasq equals 60 Sa’s.) (For gold 20, Dinars i.e. equal to 12 Guinea English. No Zakat for less than 12 Guinea (English) of gold or for silver less than 22 Fransa Riyals of Yamen.)”