Ya-Sin - 36:6

لِتُنذِرَ قَوْمًا مَّا أُنذِرَ آبَاؤُهُمْ فَهُمْ غَافِلُونَ
[36:6]
That you may warn a people whose fathers were not warned, so they are heedless.
In order that thou mayest admonish a people, whose fathers had received no admonition, and who therefore remain heedless (of the Signs of Allah).
That thou mayst warn a folk whose fathers were not warned, so they are heedless.