Jami` at-Tirmidhi 676
جامع الترمذي#676SahihIbn Umar narrated:"The Messenger of Allah made Sadaqatul-Fitr of Ramadan an obligation - a Sa of dried dates or a Sa of barley - required upon every free person and slave, male and female among the Muslims
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 7:60