As it is well known, sociolinguistics is based on the idea that language is a social institution and an acquired phenomenon, established by members of society through mutual agreement to fulfill their needs and desires. Ibn Jinni defines language as "sounds through which each group expresses its purposes." One of the main reasons for the emergence of Arabic grammar was the social motivation of pride in the Arabic language and the need to preserve it from those who entered Islam, as they required learning Arabic to study and memorize the Qur’an. Since this interaction had an impact on the language, I found it necessary to explore this interdisciplinary sociolinguistic approach in the phenomenon of lahn (linguistic errors). The study is structured into an introduction, two main sections, a conclusion, and a bibliography. The introduction discusses the interdisciplinary study within sociolinguistics. The first section examines the impact of societies during the Islamic conquests on the Arabic language. The second section addresses the dangers of lahn and its effects on Arabic linguistic norms. The conclusion summarizes the key findings of the study.