وَسَوَآءٌ عَلَيْهِمْ ءَأَنذَرْتَهُمْ أَمْ لَمْ تُنذِرْهُمْ لَا يُؤْمِنُونَ
Wa sawaaa'un 'alaihim 'a-anzartahum am lam tunzirhum laa yu'minoon
It is all the same to them whether you warn them or not: they will not believe.
It makes no difference to them whether you warn them or not — they will not believe.