Sahih Muslim 2282
صحيح مسلم#2282SahihIbn Umar reported that the Messenger of Allah (ﷺ) prescribed Zakat-ul-Fitr of Ramadan one sa' of dates or one sa' of barley for every individual among the Muslims (whether) free man or slave, male or female, young or old
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 12:20