إِنَّ الَّذينَ كَفَروا سَواءٌ عَلَيهِم أَأَنذَرتَهُم أَم لَم تُنذِرهُم لا يُؤمِنونَ

Indeed, those who disbelieve - it is all the same for them whether you warn them or do not warn them - they will not believe.