Sahih al-Bukhari · Hadith 6712

Expiation for Unfulfilled Oaths

Narrated Al-Ju'aid bin `Abdur-Rahman: As-Sa'ib bin Yazid said, "The Sa' at the time of the Prophet (ﷺ) was equal to one Mudd plus one-third of a Mudd of your time, and then it was increased in the time of Caliph `Umar bin `Abdul `Aziz