Abu Dawud
Oaths and Vows
Book Number: 015 / Hadith Number: 3273
Narated By 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 (pbuh).
Anas ibn Ayyad said: I tested it and found its capacity two and half mudd according to the mudd of Hisham.