إِلّا مَنِ ارتَضىٰ مِن رَسولٍ فَإِنَّهُ يَسلُكُ مِن بَينِ يَدَيهِ وَمِن خَلفِهِ رَصَدًا

Except whom He has approved of messengers, and indeed, He sends before each messenger and behind him observers