Al-Kafi's book on performances and rhymes includes the science of Bayan, which is divided into three sciences, namely (the science of meanings, the science of Bayan, and the science of Badi'ah): The first is its combination of the sciences of Bayan and presentation, and the second is its importance: Because of the importance of its author and his position among Arabic scholars, in addition to the book's good organization, division, smooth language and sweetness of words.