The Testament of Job, written sometime between 100 BC-100 AD, shows how Satan’s role and character evolved from a servant of God to the spirit of idolatry and vengeance.
The Devil is the personification of evil in many religious belief systems. He is often the direct adversary of God and is engaged in the cosmic battle between good and evil. In Christianity and Islam, the Devil is portrayed as a fallen angel or demon responsible for tempting humanity to sin against God or directly acting in ways to cause harm to individuals. Read articles about the Devil below.