Obligatory Charity Tax After Ramadaan (Zakat ul Fitr)

Bukhari :: Book 2 :: Volume 25 :: Hadith 583

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.