Yahya related to me from Malik from Nafi from Abdullah ibn Umar
that the Messenger of Allah, may Allah bless him and grant him peace,
made the zakat of breaking the fast at the end of Ramadan obligatory
on every muslim, whether freeman or slave, male or female, and
stipulated it as a sa' of dates or a sa' of barley.
Muwatta Malik Book 17, Hadith 57