Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)
Dawud :: Book 21 : Hadith 3273
Narrated Safiyyah bint Huyayy:
Ibn Harmalah said: Umm Habib gave us a sa' and told us narration from the nephew of Safiyyah on the authority of Safiyyah that it was the sa' of the Prophet (peace_be_upon_him).
Anas ibn Ayyad said: I tested it and found its capacity two and half mudd according to the mudd of Hisham.