Mishkat al-Masabih #1729

Ibn ‘Umar said God’s messenger prescribed as the zakat payable by slave and freeman, male and female, young and old among the Muslims on breaking the fast of Ramadan a sa'* of dried dates or a sa' of barley, and gave command that this should be paid before the people went out to prayer. (Bukhari and Muslim.) * The Hijazi sa' is described as a measure equivalent to four mudds, the mudd being the amount a man with average size hands can hold with both hands extended.