Sahih Muslim Book 5, Hadith Number 2149.

Chapter : Taking out of Sadaqat-ul-Fitr before observing Fitr prayer.

Ibn Umar said that Allah’s Messenger (way peace be upon him) prescribed the payment of Zakat-ul-Fitr (on breaking the fast) of Ramadan for people, for every freeman, or slave, male and female among the Muslims-one sa’ of dried dates, or one sa’ of barley.