Sahih Bukhari 1509

Narrated Abu Sa`id Al-Khudri: In the lifetime of Allah's Apostle , we used to give one Sa' of food (edible things) as Sadaqat-ul-Fitr (to the poor). Our food used to be either of barley, raisins (dried grapes), cottage cheese or dates. ..

Narrated Nafi`: Ibn `Umar said, The Prophet made incumbent on every male or female, free man or slave, the payment of one Sa' of dates or barley as Sadaqat-ul-Fitr (or said Sadaqa-Ramadan). The people then substituted half Sa' of wheat for..

Narrated Ibn `Umar: Allah's Apostle has made Sadaqat-ul-Fitr obligatory, (and it was), either one Sa' of barley or one Sa' of dates (and its payment was obligatory) on young and old people, and on free men as well as on slaves. ..