This article is a summary of the books "The formation process of the Persian language" and 
"Sahah Al-Ajam's Dictionary of Turkish Vocabulary".
In the general view of this article, it discusses the mutual influence of the three languages 
Turkish, Arabic and Persian, which have the most written works in the field of Islamic sciences, 
and explores the way the Persian language was formed under the influence of the Turkish 
language. The question here is when the Turks themselves had calligraphy before the coming 
of Islam. Why didn't they follow it? And at the same time, why did they pay so much attention 
to the Persian language? This issue is examined from the historical, linguistic, psychological 
and sociological point of view, and then the causes of the change in the history of this issue are 
discussed.
The main theory that this article aims to explain is that the Persian language is an innovative, 
simple and new language that was created in the 10th century AD (4 Hijri) in Mevra al-Nahr as 
a result of the mixing of the Arab, Sogdian and Turkic peoples of the region. Of course, this 
main theory is the result of a collection of sub-theories, which have been given by various 
Persian language researchers and experts and others. Of course, sub-theory does not mean that 
they are less important, each of them is a coherent and comprehensive theory that was presented 
by experts at a certain point in time, and finally, it is the set of these theories that leads us to 
present a more general theory. For example, when Saeed Nafisi says that the real homeland of 
the Dari (Persian) language is Khorasan and Mavral Nahr, and Pahlavi is in another area. Or 
when Dr. Shahrani writes that the mother tongue of no nation has not been Dari (Persian), in 
fact these theories are the result of a lifetime of efforts in this field. Apart from the issue of 
theories, even in the case of important statistical results, such a situation prevails. When 
Khanleri comes to the conclusion that there are no more than 200 simple verbs with 
reproductive ability in the Persian language, in fact, this conclusion is the result of his life. And 
similar to them, when the author of this article found 2,500 simple Turkish verbs and a total of 
26,000 transitive verbs in the Erek dictionary, in fact, this finding was the result of 15 years of 
work in preparing this dictionary. The meaning of saying these things is that each of these 
theories and even the statistical results are the result of a long effort of working on them and 
perhaps books have been researched and written to reach these theories, here 16 theories are 
given in general and Their results provide a possibility to present a more general theory.