إِنَّ الَّذِينَ كَفَرُواْ سَوَاءٌ عَلَيْهِمْ أَأَنذَرْتَهُمْ أَمْ لَمْ تُنذِرْهُمْ لاَ يُؤْمِنُونَ
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سورة البقرة
(2/6) Verily, those who disbelieve, it is the same to them whether you warn them or do not warn them, they will not believe.
Surah Al-Baqarah