﴿ 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 –”

Save unto every messenger whom he hath chosen) He reveals to them some instances of the Unseen, (and then He maketh a guard) angels (to go before him) before the messenger (and a guard behind him) to protect him from the jinn, devils and human beings so that they do not hear Gabriel reciting the revelations.