وَما جَعَلنا أَصحابَ النّارِ إِلّا مَلائِكَةً ۙ وَما جَعَلنا عِدَّتَهُم إِلّا فِتنَةً لِلَّذينَ كَفَروا لِيَستَيقِنَ الَّذينَ أوتُوا الكِتابَ وَيَزدادَ الَّذينَ آمَنوا إيمانًا ۙ وَلا يَرتابَ الَّذينَ أوتُوا الكِتابَ وَالمُؤمِنونَ ۙ وَلِيَقولَ الَّذينَ في قُلوبِهِم مَرَضٌ وَالكافِرونَ ماذا أَرادَ اللَّهُ بِهـٰذا مَثَلًا ۚ كَذٰلِكَ يُضِلُّ اللَّهُ مَن يَشاءُ وَيَهدي مَن يَشاءُ ۚ وَما يَعلَمُ جُنودَ رَبِّكَ إِلّا هُوَ ۚ وَما هِيَ إِلّا ذِكرىٰ لِلبَشَرِ

We appointed angels as wardens of the Fire, and We set their number as a trial for the unbelievers, to reassure those who were given the Scripture, to strengthen the faith of the believers, and to remove any doubts from those who were given the Scripture and the believers. Those whose hearts harbor disease and the unbelievers will ask, “What does God intend by this parable?” Thus, God misguides whom He wills and guides whom He wills. None knows the soldiers of your Lord except Him. It is nothing but a reminder for humans.