Al-Anfal 8:53

Thalika bi-anna Allaha lamyaku mughayyiran niAAmatan anAAamaha AAala qawmin hattayughayyiroo ma bi-anfusihim waanna Allaha sameeAAunAAaleem

That is because Allāh would not change a favor which He had bestowed upon a people until they change what is within themselves. And indeed, Allāh is Hearing and Knowing.

All this is because Allah is not the one who may change a favour He has conferred on a people unless they change their own condition, and that Allah is All-Hearing, All-Knowing.