´Ibn Umar narrated that:` the Messenger of Allah enjoined Zakatul-Fitr, one Sa of dates or one Sa of barley.Abdullah said: The people made two Mudd (equal to half of a Sa) of wheat as its equivalent.
Hadith ReferenceSunan Ibn Majah / The Chapters Regarding Zakat / Hadith: 1825
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:بخاري ومسلم