What are the reasons for the aggressive campaigns of the Arabs?

The aggressive actions of the Arabs were driven by the goal of obtaining wealth and expanding influence in the region. Together with this “infidel” the religion of the conqueror and the way of life corresponding to religion were implanted. The difference in the standard of living of the Arabian Arabs pushed them to campaigns in Syria and Egypt, where the Byzantine Empire was spread. The morale of the Arabs to improve their position even with a small army helped to achieve success in battles with the enemy. The success was also helped by the kinship of the peoples of the neighboring territories.