Qur'an, Fatir, Surah 35:5-8
Men and women, the promise of God is true. Do not be deceived by the life of this world; and do not let Satan trick you about God. Satan is your enemy, so treat him as such. He lures his followers to become heirs of hell. Those who do evil, generally believe that their actions are right. God leaves some people in error, and guides others towards the truth, as he pleases. "Muhammad, do not waste away worrying about unbelievers; God knows all their actions."