A document taken from the book, Islam: A Short Story by Karen Armstrong, states that for a long time the Arabs would attack other tribes, this act was called the ghazu, for better quality resources, since the Arabs live on the Arabian Peninsula that is 900,000 square miles of desert. Islam put a stop to the ghazu because the Muslim community was not allowed to attack each other. The Muslims then had to find another way to get the resources that they needed without breaking the rules so they started a series of ghazis against non-Muslim communities. The bringing together of the Muslim communities helped a direct offensive attack against Persia and Byzantium; who were exhausted from engaging against each other for decades. By going against these two empires and non-Muslim territories the Islamic religion was able to stay pure and continue to spread. Written in a document from a book, The Origins of the Islamic State by Ahmad Ibn-Jabir