What are the reasons for the unification of the Arab tribes?

The Arabs were divided into many tribes and clans. Many of them were nomadic and semi-nomadic. The Arab people did not have their own state and a strong leader. The tribes waged an internecine war among themselves for the best pastures. A single religion did not exist among the Arabs, and numerous tribes worshiped different deities. The Arabs had an unwritten law of blood feud, which was passed down from generation to generation as an inheritance. The only thing that united the Arab tribes was the language. Everything changed with the adoption of Islam by the Arabs. A single Arabic language contributed to the spread of Islam – the religion that united the Arabs.