question #3 Sahih al-Bukhari 6712, Book 84, Hadith 5 : Who was responsible for changing the measurement of the Sa’ after the Prophet’s time?

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.”