Sunan an-Nasa'i 2501
سنن النسائي#2501SahihIt was narrated that Ibn 'Umar said:"The Messenger of Allah enjoined Sadaqatul Fitr upon male and female, free and slave; a Sa of dates or a Sa of barley." He said: "The people considered that equivalent to half a Sa of wheat
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 23:67