46:8
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 do they say, "He has invented it?" Say, "If I have invented it, you will not possess for me [the power of protection] from Allah 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."
Context in Surah Al-Ahqaf
Nearby ayahs help place verse 46:8 in sequence and meaning.
وَإِذَا حُشِرَ ٱلنَّاسُ كَانُوا۟ لَهُمْ أَعْدَآءً وَكَانُوا۟ بِعِبَادَتِهِمْ كَـٰفِرِينَ
And when the people are gathered [that Day], they [who were invoked] will be enemies to them, and they will be deniers of their worship.
وَإِذَا تُتْلَىٰ عَلَيْهِمْ ءَايَـٰتُنَا بَيِّنَـٰتٍ قَالَ ٱلَّذِينَ كَفَرُوا۟ لِلْحَقِّ لَمَّا جَآءَهُمْ هَـٰذَا سِحْرٌ مُّبِينٌ
And when Our verses are recited to them as clear evidences, those who disbelieve say of the truth when it has come to them, "This is obvious magic."
قُلْ مَا كُنتُ بِدْعًا مِّنَ ٱلرُّسُلِ وَمَآ أَدْرِى مَا يُفْعَلُ بِى وَلَا بِكُمْ ۖ إِنْ أَتَّبِعُ إِلَّا مَا يُوحَىٰٓ إِلَىَّ وَمَآ أَنَا۠ إِلَّا نَذِيرٌ مُّبِينٌ
Say, "I am not something original among the messengers, nor do I know what will be done with me or with you. I only follow that which is revealed to me, and I am not but a clear warner."
قُلْ أَرَءَيْتُمْ إِن كَانَ مِنْ عِندِ ٱللَّهِ وَكَفَرْتُم بِهِۦ وَشَهِدَ شَاهِدٌ مِّنۢ بَنِىٓ إِسْرَٰٓءِيلَ عَلَىٰ مِثْلِهِۦ فَـَٔامَنَ وَٱسْتَكْبَرْتُمْ ۖ إِنَّ ٱللَّهَ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّـٰلِمِينَ
Say, "Have you considered: if the Qur'an was from Allah, and you disbelieved in it while a witness from the Children of Israel has testified to something similar and believed while you were arrogant...?" Indeed, Allah does not guide the wrongdoing people.