Arab dialects before Islam were varied and differentiated in terms of vocabulary, methods, and structures. However, there was a unified dialect used in the writing of poems, covenants. Who reads the poetry, for example, ancient poetry, such as the poetry of Anatra ibn Shaddad (poet before Islam)
There is no difficulty in understanding it or knowing it and writing it. It was written almost 1500 years ago. The unified dialect continued after the emergence of Islam, which was the dialect that the Holy Quran has been revealed into it (the unified language) and it is known as “common language” as it was known to some ancient Arab scholars and modern scholars as the dialect of Quraish. There were several dialects at the time were represented in the common Arabic language including Tamim`s dialect, Assad, Qais, Bakr dialects and tribes of Yemen. However, they can easily understand each other but they are difficult to read and write, but they resort to common language if they are forced to do so. It is a language that still exists today in books and newspapers, Arabs learn it and the non-Arabs students as well. The Arabic language has many different dialects that come from the classical old language. The common dialects don`t have any grammatical rules or dictionaries for its vocabularies or a literate way of writing it. Some common dialects are closer to the classical than the other dialects. Among these common dialects are: Egyptian dialect, Saudi Arabia, Libyan, Syrian, dialect and others
It is difficult to divide dialects according to the state, but can be divided dialects according to the city or village, each country or region or city has a different dialect than the other. There is no doubt that all have origins in the Arabic language, it should be noted that the Arabic colloquium dialects is still easy to understand between most of it, due to the similarity of vocabulary and its roots. The proximity of Arab countries and the unity of their religion and customs and the presence of television and radio and so on helped to make it easy.
It is clear that the most important dialect of contemporary Arabic dialects is the Egyptian dialect. It is a dialect known to all the people of the Arab countries, but it came to the conclusion that many non-Arabs speak it in perfect way, perhaps before mastering the classical Arabic language. And this is because the spreading of Egyptian in many countries, also; the position of Egypt at the heart of the Islamic and Arabic nation, and for other reasons
As the Arabs have ancient dialects and there is a common language that is still alive, there are also colloquial dialects of Arabic and there is a famous one which is the Egyptian dialect, but the old classical language is still the common element between all the countries and the Arab and Islamic countries to clarify meanings, speaking, communication, and above all; it is the official language, the language of books, culture, politics, education and so on.