Al-Ahqaf - 46:8

أَمْ يَقُولُونَ افْتَرَاهُ قُلْ إِنِ افْتَرَيْتُهُ فَلَا تَمْلِكُونَ لِي مِنَ اللَّهِ شَيْئًا هُوَ أَعْلَمُ بِمَا تُفِيضُونَ فِيهِ كَفَى بِهِ شَهِيدًا بَيْنِي وَبَيْنَكُمْ وَهُوَ الْغَفُورُ الرَّحِيمُ
[46:8]
Nay! they say: He has forged it. Say: If I have forged it, you do not control anything for me from Allah; He knows best what you utter concerning it; He is enough as a witness between me and you, and He is the Forgiving, the Merciful.
Or do they say, "He has forged it"? Say: "Had I forged it, then can ye obtain no single (blessing) for me from Allah. He knows best of that whereof ye talk (so glibly)! Enough is He for a witness between me and you! And he is Oft-Forgiving, Most Merciful."
Or say they: He hath invented it? Say (O Muhammad): If I have invented it, still ye have no power to support me against Allah. He is Best Aware of what ye say among yourselves concerning it. He sufficeth for a witness between me and you. And He is the Forgiving, the Merciful.