Surah Ya-Sin 36:6

لِتُنذِرَ قَوْمًا مَّآ أُنذِرَ ءَابَآؤُهُمْ فَهُمْ غَـٰفِلُونَ

That you may warn a people whose forefathers were not warned, so they are unaware.

Translation: Saheeh International

Tafsir

that you may warn therewith a people qawman connected to tanzīla ‘a revelation’ whose fathers were not warned in the period of the interval al-fatra so they this people are oblivious to faith and right guidance.

Excerpt from Tafsir al-Jalalayn, commentary on 36:6, via Quran.com. The reader has the full commentary and 9 more tafsirs.