Life In Iran

Iran was gradually Islamized after the collapse of the Sassanid Empire; however, it was not Arabized. Iranian culture re-emerged with a separate and distinctive character and made an immense contribution to the Islamic civilization. When Islam came through Iran, what developed was an Iranian Islam or Persian Islam rather than the original Arab Islam, and this new Islam is sometimes referred to by scholars as Islam-i Ajam (Persian Islam).
It was this Persian Islam and Sufism which was brought to new areas and new peoples such as the Turks of Central Asia, the Ottoman Empire, and the Indian subcontinent. Among the major Iranian Muslims who cultivated Sufism and helped the spread of Islam through Sufism, one can mention Habib Ajami, Hallaj, Hasan Basri, Junayd Baghdadi, Bayazid Bastami, Maruf Karkhi, Abdul-Qadir Gilani, Moinuddin Chishti, Jalaluddin Rumi, Najmuddin Kubra, and Baha-ud-Din Naqshband Bukhari. Note should also be made of Abu Hanifa, the founder of the Hanafi school of thought which is followed by most Muslims today.
Arabic writer Ibn Khaldun has remarked that the sedentary culture which was necessary for the development of civilization was rooted in the Persian empire.
One of the main developments after the advent of Islam in Iran was the rise of the New Persian language as an important Indo-European language. The New Persian language was an evolution of Middle Persian, which in turn was derived from Old Persian. New Persian absorbed a considerable amount of Arabic vocabulary during this era, although the Arabic vocabulary that was Persianized often took a different meaning than the Arabic origin. In terms of contribution to the Arabic language, Iranians like Sibawayhi pioneered writing books of grammar of the Arabic language.