Uqba bin Mukaram bin Aflah al-''Ami عقبة بن مكرم · The Book on Zakat

the Messenger of Allah said: "Indeed charity extinguishes the Lord's anger and it protects against the evil death."

the Prophet sent a caller in the roads of Makkah proclaiming "Sadaqatul-Fitr is required upon every Muslim, male or female, free or slave, young or old; it is two Mudd of wheat or its equivalent of a Sa of food."