13:11 For each (such person) there are (angels) in succession before and behind him: they guard him by command of Allah. Verily never will Allah change the condition of a people until they change it themselves (with their own souls). 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.

8:53 "Because Allah will never change the grace which He hath bestowed on a people until they change what is in their (own) souls: and verily Allah is He Who heareth and knoweth (all things).