Surah Al-An'am, Verse 131

ذَٰلِكَ أَن لَّمۡ يَكُن رَّبُّكَ مُهۡلِكَ ٱلۡقُرَىٰ بِظُلۡمٖ وَأَهۡلُهَا غَٰفِلُونَ١٣١

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.