DAY 29: Muddathir 31

•  We have appointed none but angels as the keepers of the Fire, and We have not made their number but as a trial for the disbelievers so that  the People of the Book will be convinced and the believers' faith will increase,  and neither  the People of the Book nor the believers will fall into any doubt. As for those in whose hearts there is a sickness as well as the disbelievers, they will say: “What does Allah intend by this example?” Thus Allah lets go astray whomever He wills, and leads to the right path whomever He wills. And none knows the hosts of your Lord but He. And this (description of Hell) is only a reminder to humanity.