Sunan an-Nasa'i 1580

It was narrated from Al-Hasan that :Ibn 'Abbas gave a Khutbah in Al-Basrah and said: "Pay the zakah of your fasting." The people started looking at one another. He said: "Whoever there is here from the people of Al-Madinah, get up and teach your brothers, for they do not know that the Messenger of Allah (ﷺ) enjoined sadaqat al-fitr on the young and the old, the free and the slave, the male and the female; half a sa' of wheat or a sa' of dried dates or barley