Translation of Sahih Bukhari, Book 25:

Obligatory Charity Tax After Ramadaan (Zakat ul Fitr)

Volume 2, Book 25, Number 579:

Narrated Ibn Umar:

Allah's Apostle enjoined the payment of one Sa' of dates or one Sa' of barley as Zakat-ul-Fitr on every Muslim slave or free, male or female, young or old, and he ordered that it be paid before the people went out to offer the 'Id prayer. (One Sa' = 3 Kilograms approx.)

Narrated Ibn 'Umar:

Allah's Apostle made it incumbent on all the slave or free Muslims, male or female, to pay one Sa' of dates or barley as Zakat-ul-Fitr.

Narrated Abu Said:

We used to give one Sa' of barley as Sadaqatul-Fitr (per head).

Narrated Abu Said Al-Khudri:

We used to give one Sa' of meal or one Sa' of barley or one Sa' of dates, or one Sa' of cottage cheese or one Sa' of Raisins (dried grapes) as Zakat-ul-Fitr.

Narrated 'Abdullah bin 'Umar

The Prophet ordered (Muslims) to give one Sa' of dates or one Sa' of barley as Zakat-ul-Fitr. The people rewarded two Mudds of wheat as equal to that.

Narrated Abu Sa'id Al-Khudri:

In the life-time of the Prophet we used to give one Sa' of food or one Sa' of dates or one Sa' of barley or one Sa' of Raisins (dried grapes) as Sadaqat-ul-Fitr. And when Muawiya became the Caliph and the wheat was (available in abundance) he said, "I think (observe) that one Mudd (of wheat) equals two Mudds (of any of the above mentioned things).

Narrated Ibn 'Umar:

The Prophet ordered the people to pay Zakat-ul-Fitr before going to the 'Id prayer.

Narrated Abu Said Al-Khudri:

In the life-time of Allah's Apostle , we used to give one Sa' of food (edible things) as Sadaqat-ul-Fit,r (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 that. Ibn 'Umar used to give dates (as Sadaqat-ulFitr). Once there was scarcity of dates in Medina and Ibn 'Umar gave barley. 'And Ibn 'Umar used to give Sadaqat-ul-Fitr for every young and old person. He even used to give on behalf of my children. Ibn 'Umar used to give Sadaqatul-Fitr to those who had been officially appointed for its collection. People used to give Sadaqat-ul-Fitr (even) a day or two before the 'Id.

Narrated Ibn 'Umar:

Allah's Apostle has made Sadaqatul-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.