Sure 30 Ar-Rum (The Romans), ajet 58

1. وَلَقَدْ ضَرَبْنَا لِلنَّاسِ فِي هَٰذَا الْقُرْآنِ مِنْ كُلِّ مَثَلٍ ۚ وَلَئِنْ جِئْتَهُمْ بِآيَةٍ لَيَقُولَنَّ الَّذِينَ كَفَرُوا إِنْ أَنْتُمْ إِلَّا مُبْطِلُونَ

   And We have certainly presented to the people in this Qur'an from every (kind of) example. But, (O Muhammad), if you should bring them a sign, the disbelievers will surely say, "You (believers) are but falsifiers."

   30:58

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