Chapter on Amount of Fitrah

And from him, from Hammad ibn Isa, from Muawiyah ibn Wahb, who said: I (narrator) heard Abu Abdillah عليه السلام, peace be upon him, saying: “Regarding the Fitrah, the Sunnah was established as one sa’ of dates, or one sa’ of raisins, or one sa’ of barley. Then when it was in the time of Uthman and wheat became abundant, the people assessed its value. So Uthman said, ‘Half a sa’ of wheat (burr) is equal to one sa’ of barley.’”