He died A.D. 822, at the age of sixty-three, and preceded both Mubarrad and Thalab, the latter of whom used to say: 'Were it not for Al-Farra, pure Arabic would no longer exist; it was he who disengaged it from the ordinary language and fixed it by writing.
' At the request of the Khalif Al-Mamun he drew up in two years a most elaborate work, which contained the principles of grammar, and all the pure Arabic expressions which he had heard. It was entitled 'Al-Hudûd' (the Limits or Chapters), and directly it was finished he commenced another in connection with the Koran, which is spoken of as a most wonderful production. He wrote besides several other works on grammar, and acted as tutor to the two sons of the Khalif Mamun.