The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2339
Abu Huraira reported that Hasan b. 'Ali took one of The dates of the sadaqa and put it in his mouth, whereupon the Prophet (may peace be upon him) said: Leave it, leave it, throw it; don't you know that we do not eat the sadaqa?