Sahih Muslim Book 5, Hadith Number 2352.

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

‘Aisha reported that (once) the Apostle of Allah (may peace be upon him,) was presented with beef. It was said (by someone) that it had been given to Barira as Sadaqa. Upon this he (the Prophet) said: It is a Sadaqa for her and a gift for us.