سنن ابن ماجه

It was narrated that: Abu Sa'eed Al-Khudri said: “We used to pay Zakatul-Fitr when the Messenger of Allah (ﷺ) was among us, one Sa of food, one Sa of dates, one Sa of barley, one Sa of sun-baked cottage cheese, one Sa of raisins. We continued to do that until Mu'awiyah came to us in Al-Madinah. One of the things he said to the people was: 'I think that two Mudd wheat from Sham is equivalent to one Sa of this (i.e. dates).' So the people followed that.”Abu Sa'eed said: “I'll continue to pay it as I used to pay it at the time of Messenger of Allah for as long as I live.”