Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "The people of Iraq have withheld their dirham and their qafiz (a measure), the people of Syria have withheld their mudy and their dinar, and Egypt has withheld its irdabb (a measure of twenty-four sa') and its dinar, and you will return to where you began," and he (peace and blessings be upon him) said this three times. The flesh and blood of Sayyiduna Abu Hurayrah (may Allah be pleased with him) bear witness to this. Yahya said: By this hadith he means that the Messenger of Allah (peace and blessings be upon him) mentioned the qafiz and the dirham before Sayyiduna Umar (may Allah be pleased with him) imposed it on the people of the land.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18385