* Narrated Said bin Jubair:
Ibn 'Abbas in the explanation of the Statement of Allah. 'Move not
your tongue concerning (the Quran) to make haste therewith." (al-Qiyamah 75:16)
Said "Allah's Apostle used to bear the revelation with great trouble
and used to move his lips (quickly) with the Inspiration." Ibn 'Abbas
moved his lips saying, "I am moving my lips in front of you as
Allah's Apostle used to move his." Said moved his lips saying: "I am
moving my lips, as I saw Ibn 'Abbas moving his." Ibn 'Abbas added,
"So Allah revealed 'Move not your tongue concerning (the Qur'an) to
make haste therewith. It is for us to collect it and to give you (O
Muhammad) the ability to recite it (the Qur'an) (al-Qiyamah 75:16-17) which
means that Allah will make him (the Prophet) remember the portion of
the Qur'an which was revealed at that time by heart and recite it.
The Statement of Allah: And 'When we have recited it to you (O
Muhammad through Gabriel) then you follow its (Qur'an) recital'
(al-Qiyamah 75:18) means 'listen to it and be silent.' Then it is for Us (Allah)
to make It clear to you' (al-Qiyamah 75:19) means 'Then it is (for Allah) to
make you recite it (and its meaning will be clear by itself through
your tongue). Afterwards, Allah's Apostle used to listen to Gabriel
whenever he came and after his departure he used to recite it as
Gabriel had recited it."
(Sahih Bukhari 1.4)