It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "There is no zakat on silver less than five awqiyah."
It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Zakat is not obligatory on silver less than five awqiyah, nor is zakat obligatory on camels less than five, nor is there zakat on grain less than five wasq."