May be pondering of these verses will remove any doubt
Move not thy tongue concerning the (Qur'an) to make haste therewith.
Move not your tongue with it, [O Muhammad], to hasten with recitation of the Qur'an.
Indeed, upon Us is its collection [in your heart] and [to make possible] its recitation.
It is for Us to collect it and to promulgate it:
So when We have recited it [through Gabriel], then follow its recitation.
But when We have promulgated it, follow thou its recital (as promulgated):
Then upon Us is its clarification [to you].
Nay more, it is for Us to explain it (and make it clear):