﴿ إِلَّا مَنِ ٱرْتَضَىٰ مِن رَّسُولٍۢ فَإِنَّهُۥ يَسْلُكُ مِنۢ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِۦ رَصَدًۭا ﴾

“unless it be to an apostle whom He has been pleased to elect [there for]: and then He sends forth [the forces of heaven] to watch over him in whatever lies open before him and in what is beyond his ken –”

except to a messenger of whom He approves. Then in addition to disclosing to him what He will to disclose of it by way of making it a miracle for him He despatches He appoints and sends forth before him namely the Messenger and behind him watchers angels to preserve him until He has conveyed it to him as part of the entire revelation