Ulum al Qur'an
The Language of the Quraish
In the time of the Prophet Muhammad when the Qur'an was revealed, the Arab tribes scattered all over the peninsula, spoke a number of dialects, each containing peculiar words and idioms.
The language of the Quraish had developed into a form of 'high Arabic' due to the many influences it absorbed, being spoken at the main centre of trade and pilgrimage in Arabia. Hence this language was obviously the most suitable to carry the messages of revelation which were to reach all peoples and not be restricted to a particular tribe.