Narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: "O Allah! Bless them (i.e., the people of Madinah) in their measures, sa’ and mudd (units of measurement)."

Narrated from Sayyiduna Sa’ib bin Yazid (may Allah be pleased with him): In the time of the Prophet (peace and blessings of Allah be upon him), the Sa’ (which is a measure of volume) was equal to your one Mudd and one third of it.