do they say he has invented this book himself? say if that is so bring ten surahs the like of it of your composition and call upon all you can other than allah to your help. do so if you are truthful.
أم يقولون افتراه قل فأتوا بعشر سور مثله مفتريات وادعوا من استطعتم من دون الله إن كنتم صادقين