Rejection and obstinacy of disbelievers

وَلَقَدْ ضَرَبْنَا لِلنَّاسِ فِى هَـٰذَا ٱلْقُرْءَانِ مِن كُلِّ مَثَلٍ ۚ وَلَئِن جِئْتَهُم بِـَٔايَةٍ لَّيَقُولَنَّ ٱلَّذِينَ كَفَرُوٓا۟ إِنْ أَنتُمْ إِلَّا مُبْطِلُونَ

And We have certainly presented to the people in this Qur’ān from every [kind of] example. But, [O Muḥammad], if you should bring them a sign, the disbelievers will surely say, "You [believers] are but falsifiers."