لَهُ مُعَقِّبَاتٌ مِّن بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِ يَحْفَظُونَهُ مِنْ أَمْرِ اللّهِ إِنَّ اللّهَ لاَ يُغَيِّرُ مَا بِقَوْمٍ حَتَّى يُغَيِّرُواْ مَا بِأَنْفُسِهِمْ وَإِذَا أَرَادَ اللّهُ بِقَوْمٍ سُوءًا فَلاَ مَرَدَّ لَهُ وَمَا لَهُم مِّن دُونِهِ مِن وَالٍ
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سورة الرّعد
(13/11) For them (those in that nation) there are those who follow before them and behind them (that extends from the front side to the back) (the angels guarding the Imam of the Time). They guard them, being from the Command of Allah. Surely Allah does not alter what is in a people (He does not take away the spirit of the Imam of the Time from over their heads) unless they alter what is in their souls (their intention of remaining in Hidayet). And when Allah wills punishment to a people, there is no averting it. And there is for them besides Him no protecting friend.
Surah Ar-Ra'd