Introducing the manuscript " Riyazolfetyan Ibn Hossam heravi " and orthography and stylistic characteristics of it

"Nesabossebyan" written by Abu Nasr Farahi is an educational poetic collection in lexis and literary science. It has been the focus of attention of the scientists and writers since its writing until the 14th century so that upon which too many commentaries were written. "Riyaz Alftyan" written by Ibne Hossam heravy whose author and the masterpiece itself have not been Introduced yet is one of its best commentaries and versions in the Teimurian period. The main issue in this paper is to introduce"Riyaz Alftyan,its investigation and innovation,stylistic and writing features,and introduction of its author. The findings of the present study obtained through a descriptive analysis procedure and on the basis of documentary method show that Nezamoddin Ibne Kamaloddin Ibne Jamoloddin Khafi Heravi known as Ibne Hesam Heravi is the philologist of the Teimurian age and his "Riyaz Alftyan" as an educational text is the oldest and most comprehensive commentaries of "Nesabossebyan " whose significan characteristics are miscellaneous writing, description,and documentary and testimonial extension of words. Morever,the masterpiece,is of high frequency in allusion, excerption, and reference to Koran verses and Tradition and refrence to the valid books of vocabulary. Ibne Hesam has greatly endeavoured in accurate registration of words inaddition to eloguence, tradition, and his masterpiece is the biggest treasury for introducing and interpreting "Moarrabat"(the Arabicized loaned words)