Yunus 10:38

Am yaqooloona iftarahu qul fa/toobisooratin mithlihi wadAAoo mani istataAAtum mindooni Allahi in kuntum sadiqeen

Or do they say [about the Prophet (ﷺ)], "He invented it?" Say, "Then bring forth a sūrah like it and call upon [for assistance] whomever you can besides Allāh, if you should be truthful."

Or, do they say that he has made it up? Say, “Then, bring a Sūrah like this, and call whomsoever you can beside Allah, if you are true.”