The debate "Al-Lail and Nahar" is written by Ali bin Fathullah Madani Isfahani, which was writtenin the 9th century. Madani is one of the 9th century writers in Isfahan. The "Al-Lail and Nahar Debate" is one of the most important works in the field of prose debates. Therefore, the author introduced the version due to the importance of the topic and its pioneering in the evolution of prose debate writing. The only manuscript of this work is kept in Istanbul University Library Museum in Turkey. The collection of information in this article was done in a library method and it was written in a descriptive and analytical way. The current research examined this debate on three intellectual, literary and linguistic levels. Among the results obtained, some features are worth mentioning: the use of Masja's prose- extensive attention to the use of Persian poems, verses and hadiths - extensive use of arrays of similes, metaphors and irony - frequent replacement of sentence elements and descriptive sentences - as well as saj' Repetition and puns, frequent Arabic sentences and combinations are prominent stylistic features of the work. Although Madani Esfahani wrote the debate of Lail and Nahar in accordance with the prose style of the Timurid era, but there are innovations in the author's linguistic behavior that make his individual style an indicator. However, in terms of the topic of the debate and its moral result, it does not have significant innovation compared to other debates.