We appointed angels to be guardians of Hell, and we assigned their number (19) (1) to disturb the disbelievers, (2) to convince the Christians and Jews (that this is a divine scripture), (3) to strengthen the faith of the faithful, (4) to remove all traces of doubt from the hearts of Christians, Jews, as well as the believers, and (5) to expose those who harbor doubt in their hearts, and the disbelievers; they will say, “What did God mean by this allegory?” God thus sends astray whomever He wills, and guides whomever He wills. None knows the soldiers of your Lord except He. This is a reminder for the people.
وَما جَعَلنا أَصحٰبَ النّارِ إِلّا مَلٰئِكَةً وَما جَعَلنا عِدَّتَهُم إِلّا فِتنَةً لِلَّذينَ كَفَروا لِيَستَيقِنَ الَّذينَ أوتُوا الكِتٰبَ وَيَزدادَ الَّذينَ ءامَنوا إيمٰنًا وَلا يَرتابَ الَّذينَ أوتُوا الكِتٰبَ وَالمُؤمِنونَ وَلِيَقولَ الَّذينَ فى قُلوبِهِم مَرَضٌ وَالكٰفِرونَ ماذا أَرادَ اللَّهُ بِهٰذا مَثَلًا كَذٰلِكَ يُضِلُّ اللَّهُ مَن يَشاءُ وَيَهدى مَن يَشاءُ وَما يَعلَمُ جُنودَ رَبِّكَ إِلّا هُوَ وَما هِىَ إِلّا ذِكرىٰ لِلبَشَرِ
wa maaja’alnaaa As-haaban naari illaa malaaa ‘ikatanw wa maa ja’alnaa ‘iddatahum illaa fitnatal lillazeena kafaroo liyastaiqinal lazeena ootul kitaaba wa yazdaadal lazeena aamanooo eemaananw wa laa yartaabal lazeena ootul kitaaba walmu’minoona wa liyaqoolal lazeena fee quloo bihim maradunw walkaafiroona maazaaa araadal laahu bihaazaa masalaa; kazaalika yudillul laahu mai yashaaa’u wa yahdee mai yashaaa’; wa maa ya’lamu junooda rabbika illaa hoo; wa maa hiya illaa zikraa lil bashar