"Except for whom He has approved of as messengers, for indeed, He dispatches before him and behind him observers" from the angels, who protect him until he delivers the message from Allah.
﴿إِلا مَنِ ارْتَضَى مِنْ رَسُولٍ فَإِنَّهُ يَسْلُكُ مِنْ بَيْنِ يَدَيْهِ وَمن خَلفه رصدًا﴾ مِنَ الْمَلائِكَةِ يَحْفَظُونَهُ حَتَّى يُبَلِّغَ عَن الله الرسَالَة