Sahih Bukhari
Obligatory Charity Tax (Zakat)
Volume: 002 / Book Number: 024 / Hadith Number: 568
Narrated Abu Huraira :
Al-Hasan bin 'Ali took a date from the dates given in charity and put it in his mouth. The Prophet said, "Expel it from your mouth. Don't you know that we do not eat a thing which is given in charity?"