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
am yaqūlūna if'tarāhu qul ini if'taraytuhu falā tamlikūna lī mina l-lahi shayan huwa aʿlamu bimā tufīḍūna fīhi kafā bihi shahīdan baynī wabaynakum wahuwa l-ghafūru l-raḥīmu
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. Sufficient is He as Witness between me and you, and He is the Forgiving, the Merciful."
— Saheeh International
or they say, ‘He has invented it himself.’ Say [Prophet], ‘If I have really invented it, there is nothing you can do to save me from God. He knows best what you say amongst yourselves about it; He is sufficient as a witness between me and you; He is the Most Forgiving, the Most Merciful.’
— M. A. S. Abdel Haleem
Or say they: "He (Muhammad صلى الله عليه وسلم) has fabricated it." Say: "If I have fabricated it? still you have no power to support me against Allâh. He knows best of what you say among yourselves concerning it (i.e. this Qur’ân)! Sufficient is He as a witness between me and you! And He is the Oft-Forgiving, the Most Merciful."
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali