Sahih Muslim | Book 5 | Hadith Number 2154

Narrated by Sad b. Abu Sarh
Sad b. Abu Sarh heard Abu Sa'id al-Khudri as saying: We used to take out as the Zakat of Fitr one sa' of grain, or one sa' of barley or one sa' of dates, or one sa' of cheese or one sa' of raisins.