Abu Abdullah Harun ibn Musa al-'Ataki al-A'war (d. 170AH/786AD) was an early convert from Judaism to Islam and a scholar of the Arabic language and Islamic studies. He converted while living among the Azd tribe, and was later attributed to the tribe. He was affiliated with the Basran school of Arabic grammar. A specialist in lexicography, al-A'war contributed significantly to the study of Qira'at, or variant readings of the Qur'an, and is the first formal compiler of the different recitation styles. His most active period, during which his work was marked by new developments in lexicographical studies concerning the Qur'an, was from 752 until his death.