And We have made none but angels wardens of the Fire, and We have not made their number but as a trial for those who disbelieve, that those who have been given the Book may be certain and those who believe may increase in faith, and those who have been given the Book and the believers may not doubt; and that those in whose hearts is a disease and the disbelievers may say: What does Allah mean by this parable? Thus Allah leaves in error whom He pleases, and guides whom He pleases. And none knows the hosts of thy Lord but He. And this is naught but a Reminder to mortals.