Surah Al-An'am 6:131

ذَٰلِكَ أَن لَّمْ يَكُن رَّبُّكَ مُهْلِكَ ٱلْقُرَىٰ بِظُلْمٍ وَأَهْلُهَا غَـٰفِلُونَ

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

Translation: Saheeh International

Tafsir

That sending of the messengers is because an phonetically lightened with the lām of li-annahu implied thus read as li-annahu ‘because’ your Lord would never destroy the towns through injustice on their part while their inhabitants were heedless not having had any Messenger to make things clear to them.

Excerpt from Tafsir al-Jalalayn, commentary on 6:131, via Quran.com. The reader has the full commentary and 9 more tafsirs.