And Yahya ibn Yahya narrated to us, informing us Yazid ibn Zuray' from Ayyub from Nafi' from Ibn 'Umar, who said: The Prophet, peace and blessings be upon him, made the charity of Ramadan obligatory upon the free and the slave, the male and the female: a sa' of dates or a sa' of barley. He said: So the people equated it with half a sa' of wheat.