Sayyidina Abu Sa’eed Khurdri (RA) narrated that during the presence of Allah’s Messenger among them they used to give sadaqat ul-Fitr a sa’ of grain, or of barley, or f dates, or of raisin, or of cheese. Then did not cease to give in this manner till Mu’awiyah i came to Madinah. He spoke to the people, saying. “I think that two Syrian mudd of wheat are the equivalent of one sa’ of date”. So, the people adopted that. But, Abu Sa’eed (RA) said, “I did not cease to pay as I used to do (before that)”.
[Ahmed11932, Bukhari 1506, Muslim 985, Abu Dawud 1616, Nisai 2508, Ibn e Majah 1829]