Azerbaijan and the Turks in three texts from the 7th century AH

The presence of Turks in Azerbaijan and the prevalence of the Turkish language there is one of the important historical and linguistic topics in the history of Iran. The fact that the people of Azerbaijan used to speak an Iranian language before the spread of Turkish today is an inviolable principle in the history of Iranian languages. We know that Seljuk Turks entered Azerbaijan for the first time and slowly spread their language there as well. Drawing the historical influence of Turks and Turkish language in Azerbaijan can clarify the language change process in this part of Iran. In this article, we have used three Persian texts of the 7th century, two of them were selected from Azerbaijan and one from Shiraz. With the help of the documents that we have extracted from these three texts, we have shown that Turks increased in Azerbaijan in the 7th century But the Azerbaijanis considered them foreigners.