And if ye are in doubt concerning that which We reveal unto Our slave (Muhammad), then produce a surah of the like thereof, and call your witness beside Allah if ye are truthful. (2:23)
And if ye do it not - and ye can never do it - then guard yourselves against the Fire prepared for disbelievers, whose fuel is of men and stones. (2:24)
And this Qur'an is not such as could ever be invented despite of Allah; but it is a confirmation of that which was before it and an exposition of that which is decreed for mankind - Therein is no doubt - from the Lord of the Worlds. (10:37)
Or say they: He hath invented it? Say: Then bring a surah like unto it, and call (for help) on all ye can besides Allah, if ye are truthful. (10:38)
Or they say: He hath invented it. Say: Then bring ten surahs, the like thereof, invented, and call on everyone ye can beside Allah, if ye are truthful! (11:13)
Say: Verily, though mankind and the jinn should assemble to produce the like of this Qur'an, they could not produce the like thereof though they were helpers one of another. (17:88)
Or say they: He hath invented it? Nay, but they will not believe! (52:33)
Then let them produce speech the like thereof, if they are truthful. (52:34)