Holding Fast to the Qur'an and Sunnah

Bukhari :: Book 9 :: Volume 92 :: Hadith 430

Narrated As-Sa'ib bin Yazid:

The Sa' (a kind of measure) during the lifetime of the Prophet used to be equal to the one Mudd (another kind of measure) and one third of a Mudd which we use today, but the Sa' of today has become large.