That you may warn a people whose forefathers were not warned, so they are unaware.
The Saheeh International Quran Translation
لِتُنذِرَ قَوْمًا مَّآ أُنذِرَ ءَابَآؤُهُمْ فَهُمْ غَٰفِلُونَThat you may warn a people whose forefathers were not warned, so they are unaware.