Da'ud bin Qays al-Fra'a داود بن قيس الفراء الدباغ · The Book of Zakah

"Give Zakah of your fast." The people looked at one another, so he said: "Whoever is here from the people of Al-Madinah, get up and teach your brothers, for they do lnot know that this Zakah was enjoined by the Messenger of Allah upon every male and female, free and slave, a Sa' of barley or dates, or half a Sa' of wheat. "So they got up. (Da'if) Hisham contradicted him, he said: "From Muhammad bin Sirin."

"We used to pay Zakaul Fitr when the Messenger of Allah was among us; a Sa' of food, or a Sa' of barley, or a Sa' of dates, or a Sa' of raisins, or a Sa of cottage cheese."