﴿ لِتُنذِرَ قَوْمًۭا مَّآ أُنذِرَ ءَابَآؤُهُمْ فَهُمْ غَٰفِلُونَ ﴾

“[bestowed upon thee] so that thou mayest warn people whose forefathers had not been warned, and who therefore are unaware [of the meaning of right and wrong].”

Please check ayah 36:7 for complete tafsir.