A book in the jurisprudence of language, and his work was called by Al -Sahbi in relation to Al -Sahib bin Abbad, and Ibn Faris, the work of the book, had presented the book to him and deposited it in his treasury. As for the content of the book, it revolves around the Arabic language, its first and its origins, then it searches the methods of the Arabs to address them, and in the truth and metaphor,