Islam in Ethiopia is the second-most widely practised religion after Christianity. According to the latest 2007 national census, there are over 25 million (or 34%) Muslim adherents. The faith arrived in Ethiopia at an early date, shortly after the hijira. Islam is the religion of the overwhelming majority of the Somali, Afar, Argobba, Harari, Berta, Alaba, and Silt'e and also has many adherents among the Gurage and the Oromo, the largest ethnic group in Ethiopia.