In order to communicate the truth of Divine Unity, God has sent messengers or prophets to human beings, whose weakness of nature makes them ever prone to forget or even willfully to reject Divine Unity under the promptings of Satan.
According to the Qurʾānic teaching, the being who became Satan (Shayṭān or Iblīs) had previously occupied a high station but fell from divine grace by his act of disobedience in refusing to honour
Adam when he was ordered to do so. Since then his work has been to beguile human beings into error and sin. Satan is, therefore, the contemporary of humanity, and Satan’s own act of disobedience is construed by the Qurʾān as the sin of pride. Satan’s machinations will cease only on the Last Day.