It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: There is no zakat on less than five wasq, there is no zakat on less than five uqiyah of silver, and there is no zakat on less than five camels.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9221