Аль-Муддассир 74:31

(We have appointed) We set on the dwellers of the Fire (only angels) the keepers of the Fire (to be wardens of the Fire, and their number have We made) and We have not mentioned the fewness of the keepers of the Fire save (to be a stumbling block) except in order to be a calamity (for those who disbelieve) the disbelievers of Mecca: Abu'l-Ashadd Ibn Usayd Ibn Kildah who said: �I will take care of seventeen angels, nine on my back and eight on my chest; therefore you should take care of the other two�; (that those to whom the scripture) the Torah, i.e. 'Abdullah Ibn Salam and his followers, for it is written in the Torah that the number of the keepers of the Fire is nineteen (hath been given may have certainty, and that believers may increase in faith) when they know that what is in their Scripture is similar to that which is in the Torah; (and that those to whom the Scripture hath been given) 'Abdullah Ibn Salam and his followers, when they see that there is no difference between what is in the Qur'an and that which is in the Torah (and believers) also for the same reason (may not doubt; and that those in whose hearts there is disease) doubt and hypocrisy, (and disbelievers) the Jews and Christians; and it is said: the disbelievers of Mecca, (may say: What meaneth Allah by this similitude) when he mentioned the small number of angels who are in charge of the Fire? (Thus Allah sendeth astray) through this similitude (whom He will) whomever deserves it, (and whom He will) and whomever deserves (He guideth) by means of this similitude. (None knoweth the hosts of your Lord) among the angels (save Him. This is) i.e. Saqar, the fourth gate of the Fire (naught else than a Reminder unto mortals) an admonition to people in order to warn them.