Hud · 11:13

13. Do the idolaters say that Muhammad made up the Qur’ān, and that it is not revelation from Allah? Allah tells the Messenger (peace and blessing be upon him) to challenge them to write ten similar sūrahs themselves like the Qur’ān, and to call upon whomever they could call upon to help them to do this, if they were telling the truth in claiming that the Qur’ān was fabricated.