Musnad Ahmad 31:706

'Abd al-Razzaq narrated to us, Sufyan informed us, from Isma'il bin Umayyah, from Muhammad bin Yahya bin Habban, from Yahya bin 'Amarah, from Abu Sa'id al-Khudri, who said: The Prophet, peace and blessings of Allah be upon him, said: "There is no Zakat on grain or fruit until it reaches five wasqs. And there is no Zakat on less than five camels. And there is no Zakat on less than five awaq."