Al-An'am 6:131

ذَٰلِكَ أَن لَّمْ يَكُن رَّبُّكَ مُهْلِكَ ٱلْقُرَىٰ بِظُلْمٍ وَأَهْلُهَا غَـٰفِلُونَ

Dhālika an lam yakun rabbuka muh'lika l-qurā biẓul'min wa-ahluhā ghāfilūna

That is because your Lord would not destroy the cities for wrongdoing while their people were unaware.