The Treasury of Literature and the Core of Bab Lisan al-Arab is a book that is considered one of the collections of literature and one of the most widespread encyclopedias of Arabic sciences and literature in the eleventh century AH. The material of the book consists of rare texts and an investigation of everything mentioned in that, in addition to that is what the book included of Arab proverbs, and an explanation of their meanings and speculations. And its origins, and his mobilization of tribal languages and dialects