This academic work by Dr. Radia Hussein Salih delves into the rich tradition of linguistic commentary surrounding Tha'lab's seminal work, 'Al-Fasih'. The book meticulously examines the linguistic investigations and analyses presented by various scholars who wrote commentaries on 'Al-Fasih', exploring their methodologies, debates, and contributions to Arabic linguistics. It offers a comprehensive overview of phonological, morphological, and syntactic discussions, providing valuable insights for researchers and students of Arabic grammar and philology. The study highlights the evolution of linguistic thought through these critical commentaries, making it an essential resource for advanced studies in the field.