Narrated Abdullah ibn Umar: The people during the lifetime of the Messenger of Allah (ﷺ) used to bring forth the sadaqah at the end of Ramadan when closing the fast one sa' of barley whose straw is removed, or of raisins. Abdullah said: When Umar (Allah be pleased with him) succeeded, and the wheat became abundant, Umar prescribed half a sa' of wheat instead of all these things

English translation · Sunan Abu Dawud