Surah Yasin, ayah 10

وَسَوَآءٌ عَلَيۡهِمۡ ءَأَنذَرۡتَهُمۡ أَمۡ لَمۡ تُنذِرۡهُمۡ لَا يُؤۡمِنُونَ ١٠

Wasawā'un 'alayhim a'andhartahum am lam tundhirhum lā yu'minūn

And it is all the same for them whether you warn them or do not warn them - they will not believe.