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 (ﷺ).

Anas ibn Ayyad said: I tested it and found its capacity two and half mudd according to the mudd of Hisham.
Sunan Abi Dawud Book 22, Hadith 38