Concise Quran Commentary
It is all the same to these disbelievers who oppose the truth, whether you, O Muhammad, warn them or you do not warn them. They will not accept what you have brought from Allah.
وَسَوَآءٌ عَلَيْهِمْ ءَأَنذَرْتَهُمْ أَمْ لَمْ تُنذِرْهُمْ لَا يُؤْمِنُونَ
It is the same to them whether you warn them or not, they will not believe.