Sahih Muslim Book 5, Hadith Number 2343.
Chapter : The posterity of the Holy Prophet (may peace be upon him) is not allowed to make use of Sadaqa.
Out of so many ahadith which Hammam b. Munabbih narrated on the authority of Abu Huraira from the Messenger of Allah (may peace be upon him) one is this that the Messenger of Allah (may peace be upon him) said: I go back to my family and I find a date lying on my bed or in my house, and I take it up to eat it, but then I throw it away fearing that it may be a Sadaqa or from Sadaqa.