﴿ أَمْ يَقُولُونَ ٱفْتَرَىٰهُ ۖ قُلْ فَأْتُوا۟ بِسُورَةٍۢ مِّثْلِهِۦ وَٱدْعُوا۟ مَنِ ٱسْتَطَعْتُم مِّن دُونِ ٱللَّهِ إِن كُنتُمْ صَٰدِقِينَ ﴾

“And yet, they [who are bent on denying the truth] assert, "[Muhammad] has invented it!" Say [unto them]: "Produce, then, a surah of similar merit; and [to this end] call to your aid whomever you can, other than God, if what you say is true!”

(Or say they) rather, the disbelievers of Mecca say: (He hath invented it) Muhammad (pbuh) invented the Qur'an himself? (Say) to them, O Muhammad: (Then bring a surah like unto it) like the surahs of the Qur'an, (and call (for help) on all ye can) seek help for this purpose from those idols you worship (besides Allah, if ye are truthful) that Muhammad (pbuh) has invented the Qur'an.