Sahih AL Bukhari Hadith number 4.

In the name of God, the Most Gracious, the Most Merciful.
Sahih Al Bukhari Volume 1. Revelation.. Hadith number 4.
Narrated by Said bin Jubair Razi ALLAH Tala anhu.
Ibn 'Abbas in the explanation of the Statement of Allah. 'Move not your tongue concerning (the Quran) to make haste therewith." (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) (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' (75.18) means 'listen to it and be silent.' Then it is for Us (Allah) to make It clear to you' (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."

This Hadith is attributed to Said bin Jubair Razi ALLAH Tala anhu , who describes an incident involving Ibn 'Abbas Razi ALLAH Tala anhu. explaining a verse from the Quran. The verse in question is from Surah Al-Qiyamah (Chapter 75), specifically verses 16-19. The verse "Move not your tongue concerning (the Quran) to make haste therewith" (75:16) is being explained by Ibn 'Abbas.

According to Ibn 'Abbas Razi ALLAH Tala anhu., the Prophet Muhammad (peace be upon him) used to experience difficulty and exertion when receiving revelations, and he would move his lips quickly with the inspiration. To illustrate this, Ibn 'Abbas Razi ALLAH Tala anhu. and others present began moving their own lips, mimicking the Prophet's actions.

In response to this, Allah revealed the subsequent verses (75:16-19). The essence of these verses is that Allah will ensure the Prophet's ability to remember and recite the Quran at the appropriate times. The verse "And 'When we have recited it to you (O Muhammad through Gabriel) then you follow its (Qur'an) recital" (75:18) instructs the Prophet to listen attentively when the angel Gabriel recites the Quran to him and to remain silent during this process.

The statement "Then it is for Us (Allah) to make it clear to you" (75:19) means that Allah will facilitate the Prophet's recitation of the Quran, making its meaning clear through his tongue.

After receiving the revelation, the Prophet Muhammad (peace be upon him) would then recite the Quran as he had heard it from Gabriel. This narration provides insight into the process of revelation and how the Prophet received and recited the Quran under divine guidance.
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