 The Arabization of the bureaucracy and currency was the most consequential administrative reform undertaken by the caliph.Arabic ultimately became the sole official language of the Umayyad state, but the transition in faraway provinces, such as Khurasan, did not occur until the 740s.According to Gibb, the decree was the "first step towards the reorganization and unification of the diverse tax-systems in the provinces, and also a step towards a more definitely Muslim administration".