Surah Ar-Ra'd (The Thunder), Verse 11

لَهٗ مُعَقِّبٰتٌ مِّنْ بَیْنِ یَدَیْهِ وَمِنْ خَلْفِهٖ یَحْفَظُوْنَهٗ مِنْ اَمْرِ اللّٰهِ اِنَّ اللّٰهَ لَا یُغَیِّرُ مَا بِقَوْمٍ حَتّٰی یُغَیِّرُوْا مَا بِاَنْفُسِهِمْ وَاِذَاۤ اَرَادَ اللّٰهُ بِقَوْمٍ سُوْٓءًا فَلَا مَرَدَّ لَهٗ وَمَا لَهُمْ مِّنْ دُوْنِهٖ مِنْ وَّالٍ ۟

Lahoo mu'aqqibaatum mim baini yadaihi wa min khalfihee yahfazoonahoo min amril laah; innal laaha laa yughaiyiru maa biqawmin hattaa yughaiyiroo maa bianfusihim; wa izaaa araadal laahu biqawmin sooo'an falaa maradda lah; wa maa lahum min dooniheeminw waal

“For each (such person) there are (angels) in succession, before and behind him: They guard him by command of Allah. Allah does not change a people's lot unless they change what is in their hearts. But when (once) Allah willeth a people's punishment, there can be no turning it back, nor will they find, besides Him, any to protect.”

Quran 13:11 (Yusuf Ali Translation)