Nafayes al-Kalam va Arayes al-Aqlam treatise is one of the prose works of seventh century which has been written by Razi al-Din Khashaab –Ahmad bin Mahmoud Samarqandi- in 643 (A.H). According to the preface of this letter-like treatise, the author was the head of letter-writers in the very year and, obeying the command of Eftekhar Jahan (one of the leaders of Borhan dynasty), he composed this work in order to prevent the destruction of the remained works of this dynasty. This treatise is a collection of correspondences of Borhan dynasty which confirms the reappointment of their government, at least until this very year.In the text of this work, besides elaborate prose, other kinds of prose can also be identified (as one of the features of prose style in mid-seventh century) which, in general, places this work amongst the “not elaborate not simple” prose texts of this century.While introducing the author of Nafayes, this paper explains the relation between stylistic features of this treatise and the stylistic features of the seventh-century elaborate style, and also shows the place of this work amongst the works of equal grade and proves the historical significance of this book for introducing Borhan dynasty.