مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3268
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that al-Hasan said: Ibn ‘Abbas (رضي الله عنه) addressed the people at the end of Ramadan and said: O people of Basrah, pay the zakah of your fast. The people started looking at one another and he said: Who here is from among the people of Madinah? Get up and teach your brothers, for they do not know that the Messenger of Allah (ﷺ) enjoined the sadaqah (zakah) of Ramadan, half a sa’ of wheat or half a sa' of barley or a sa’ of dates, enjoined upon slave and free, male and female.
Musnad Ahmad 3291lts isnad is da'eef]