Sahih Muslim | Book 5 | Hadith Number 2139

Narrated by Abu Sa'id al-Khudri
Abu Sa'id al-Khudri reported Allah's Messenger (may peace be upon him) as saying: No Sadaqa is payable on the grains and dates till it (comes to the Weight) of five wasqs, or less than five heads of camels, or less than five uqiyas (of silver).