"Produce a Surah (Chapter) like it": "And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof..." (Quran 2:23)

"Ten Chapters": "Or do they say, 'He invented it'? Say, 'Then bring ten surahs like it that have been invented and call upon whomever you can besides Allah...'" (Quran 11:13)