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.
Hadith ReferenceSahih Bukhari / The Book of Holding Fast To The Qur’An and The Sunna / Hadith: 7330
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة