Verse 8

أَمْ يَقُولُونَ ٱفْتَرَىٰهُ قُلْ إِنِ ٱفْتَرَيْتُهُۥ فَلَا تَمْلِكُونَ لِى مِنَ ٱللَّهِ شَيْـًٔا هُوَ أَعْلَمُ بِمَا تُفِيضُونَ فِيهِ كَفَىٰ بِهِۦ شَهِيدًۢا بَيْنِى وَبَيْنَكُمْ وَهُوَ ٱلْغَفُورُ ٱلرَّحِيمُ

Or they say; he has fabricated it. Say, if I forged it, then I can gain nothing from God. He fully knows everything you scheme. He suffices as a witness between me and you. And He is the All Forgiving, The All Merciful.