Ju'ayd bin Abd al-Rahman said: Sayyiduna al-Sa'ib (may Allah be pleased with him) said to me: In the time of the Prophet (peace and blessings be upon him), the sa' was one and a third mudd by the measure of your sa' today; then it was increased in the time of Umar bin Abd al-Aziz (may Allah have mercy on him). Sayyiduna al-Sa'ib (may Allah be pleased with him) said: I too was taken on Hajj with the household of the Prophet (peace and blessings be upon him) when I was a boy.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9710