Islam is the belief in Almighty Allah, the Prophethood of Mohammed ibn Abdillah (peace be upon him and his holy progeny), and in the Hereafter. Whoever submits to these beliefs is considered a Muslim, and the rulings pertaining to Muslims apply to him. Iman is believing in the mentioned three tenets of Islam, plus the divinely ordained authority (wilayah) of the twelve Imams (peace be upon them).