Quran 46:8 from Surah Al-Ahqaf on Divine Marvels.
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
English translation: Or they say He has invented it Say If I have invented it then not you have power for me against Allah anything He knows best of what you utter concerning it Sufficient is He Sufficient is He (as) a Witness between me and between you and He (is) the Oft-Forgiving the Most Merciful
Transliteration: am yaquluna if'tarahu qul ini if'taraytuhu fala tamlikuna li mina al-lahi shayan huwa a'lamu bima tufiduna fihi kafa bihi shahidan bayni wabaynakum wahuwa al-ghafuru al-rahimu