(Al Jinn) 72 : 27
إِلَّا مَنِ ارْتَضَىٰ مِنْ رَسُولٍ فَإِنَّهُ يَسْلُكُ مِنْ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِ رَصَدًا

Except to the Messenger whom He pleases; then indeed He will lead him forward by assigning guards in front of him and behind of him.

This verse says that Allah will protect Messengers and believers who propagate Adhikr-the Message of Allah, the Food, Clothe, and Sight of human Soul-to entire Mankind by giving escort with Angels. See explanation 3: 79-80; 13: 11; 22: 52-54; and 58: 22.