الأنعام · Verse 131 / 165 · Page 144
ذَلِكَ أَن لَّمْ يَكُن رَّبُّكَ مُهْلِكَ الْقُرَى بِظُلْمٍ وَأَهْلُهَا غَافِلُونَ
Zaalika al lam yakkur Rabbuka muhlikal quraa bizulminw wa ahluhaa ghaafiloon
That is because your Lord would not destroy the cities for wrongdoing while their people were unaware.
The reason for sending messengers to mankind and jinn is so that no one is punished for the crimes they committed without a messenger having been sent to warn them and the invitation reaching them. I only punished a nation after sending messengers to them.
Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.
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