Surah Al-Ahqaf, ayah 8

أَمۡ يَقُولُونَ ٱفۡتَرَىٰهُۖ قُلۡ إِنِ ٱفۡتَرَيۡتُهُۥ فَلَا تَمۡلِكُونَ لِي مِنَ ٱللَّهِ شَيۡـًٔاۖ هُوَ أَعۡلَمُ بِمَا تُفِيضُونَ فِيهِۚ كَفَىٰ بِهِۦ شَهِيدَۢا بَيۡنِي وَبَيۡنَكُمۡۖ وَهُوَ ٱلۡغَفُورُ ٱلرَّحِيمُ ٨

Am yaqūlūnaftarāhu qul iniftaraytuhū falā tamlikūna lī minallāhi shay'an huwa a'lamu bimā tufīdūna fīhi kafā bihī shahīdā baynī wabaynakum wahuwal-ghafūrur-rahīm

Or do they say, "He has invented it"? Say, "If I have invented it, you will not possess for me [the power of protection] from Allāh at all. He is most knowing of that in which you are involved.¹⁴⁷⁸ Sufficient is He as Witness between me and you, and He is the Forgiving, the Merciful."