This is to show that your Lord never annihilates any community unjustly, while its people are unaware.
ذٰلِكَ أَن لَم يَكُن رَبُّكَ مُهلِكَ القُرىٰ بِظُلمٍ وَأَهلُها غٰفِلونَ
zaalika al lam yakkur Rabbuka muhlikal quraa bizulminw wa ahluhaa ghaafiloon