Sahih Muslim Book 5, Hadith Number 2349.

Chapter : Accepting of gift by the Holy Prophet (may peace be upon him) and refusing the Sadaqa.

Juwayriya, the wife of the Messenger of Allah (may peace be upon him)” said that Messenger of Allah (may peace be upon him) came to her and said: Is there anything to eat? She said: Messenger of Allah, I swear by God, there is no food with us except a bone of goat which my freed maid-servant was given as sadaqa. Upon this he said: Bring that to me, for it (the sadaqa) has reached its destination.