Maliks Muwatta Book 17, Hadith Number 53.

Section : Who Pays the Zakat al-Fitr.

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.