(as regards) Allah's Statement: "Move not your tongue concerning (the Qur'an) to make haste therewith." (75.16) When Gabriel revealed the Divine Inspiration in Messenger of Allah ﷺ , he (Messenger of Allah ﷺ) moved his tongue and lips, and that state used to be very hard for him, and that movement indicated that revelation was taking place. So Allah revealed in Surat Al-Qiyama which begins: 'I do swear by the Day of Resurrection...' (75) the Verses:-- 'Move not your tongue concerning (the Qur'an) to make haste therewith. It is for Us to collect it (Qur'an) in your mind, and give you the ability to recite it by heart. (75.16-17) Ibn ʿAbbas added: It is for Us to collect it (Qur'an) (in your mind), and give you the ability to recite it by heart means, "When We reveal it, listen. Then it is for Us to explain it," means, 'It is for us to explain it through your tongue.' So whenever Gabriel came to Messenger of Allah ﷺ ' he would keep quiet (and listen), and when the Angel left, the Prophet ﷺ would recite that revelation as Allah promised him.  

فِي قَوْلِهِ {لاَ تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ} قَالَ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا نَزَلَ جِبْرِيلُ بِالْوَحْىِ وَكَانَ مِمَّا يُحَرِّكُ بِهِ لِسَانَهُ وَشَفَتَيْهِ فَيَشْتَدُّ عَلَيْهِ وَكَانَ يُعْرَفُ مِنْهُ فَأَنْزَلَ اللَّهُ الآيَةَ الَّتِي فِي {لاَ أُقْسِمُ بِيَوْمِ الْقِيَامَةِ} {لاَ تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ * إِنَّ عَلَيْنَا جَمْعَهُ وَقُرْآنَهُ} قَالَ عَلَيْنَا أَنْ نَجْمَعَهُ فِي صَدْرِكَ وَقُرْآنَهُ {فَإِذَا قَرَأْنَاهُ فَاتَّبِعْ قُرْآنَهُ} فَإِذَا أَنْزَلْنَاهُ فَاسْتَمِعْ {ثُمَّ إِنَّ عَلَيْنَا بَيَانَهُ} عَلَيْنَا أَنْ نُبَيِّنَهُ بِلِسَانِكَ قَالَ فَكَانَ إِذَا أَتَاهُ جِبْرِيلُ أَطْرَقَ فَإِذَا ذَهَبَ قَرَأَهُ كَمَا وَعَدَهُ اللَّهُ {أَوْلَى لَكَ فَأَوْلَى} تَوَعُّدٌ  

˹regarding˺ the statement of Allah "Move not your tongue concerning (the Quran) to make haste therewith." (Qiyāmah 75:16), he said: the Messenger of Allah ﷺ used to bear the revelation with great trouble and used to move his lips ˹quickly˺ (along with the inspiration being revealed so that he would not forget).

Ibn ʿAbbās ˹moved his lips saying˺: I am moving my lips in front of you as the Messenger of Allah ﷺ used to move his." Saʿīd said: I am moving my lips, as I saw Ibn ʿAbbās moving his, while he was moving his own his lips.

˹The narrator added˺ So Allah revealed: "Move not your tongue with it, ˹O Muhammad˺, to hasten with it. Indeed, upon Us is its collection and its recitation." (Qiyāmah 75:16-17). He said: Its collection meaning in your heart so you can recite it. "So when We have recited it ˹through Gabriel˺, then follow its recitation." (Qiyāmah 75:18) He said: listen ˹attentively˺ and remain silent. "Then upon Us is its clarification." (Qiyāmah 75:19) Then upon us is that you recite it. Afterwards, the Messenger of Allah ﷺ used to listen ˹attentively˺ to Jibrīl (Gabriel) whenever he came, and after Jibrīl left, he used to recite it as he had recited it.  

فِي قَوْلِهِ تَعَالَى {لاَ تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ} قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يُعَالِجُ مِنَ التَّنْزِيلِ شِدَّةً وَكَانَ مِمَّا يُحَرِّكُ شَفَتَيْهِ.

فَقَالَ ابْنُ عَبَّاسٍ فَأَنَا أُحَرِّكُهُمَا لَكُمْ كَمَا كَانَ رَسُولُ اللَّهِ ﷺ يُحَرِّكُهُمَا. وَقَالَ سَعِيدٌ أَنَا أُحَرِّكُهُمَا كَمَا رَأَيْتُ ابْنَ عَبَّاسٍ يُحَرِّكُهُمَا فَحَرَّكَ شَفَتَيْهِ.

فَأَنْزَلَ اللَّهُ تَعَالَى {لاَ تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ* إِنَّ عَلَيْنَا جَمْعَهُ وَقُرْآنَهُ} قَالَ جَمْعُهُ لَهُ فِي صَدْرِكَ وَتَقْرَأَهُ {فَإِذَا قَرَأْنَاهُ فَاتَّبِعْ قُرْآنَهُ} قَالَ فَاسْتَمِعْ لَهُ وَأَنْصِتْ {ثُمَّ إِنَّ عَلَيْنَا بَيَانَهُ} ثُمَّ إِنَّ عَلَيْنَا أَنْ تَقْرَأَهُ. فَكَانَ رَسُولُ اللَّهِ ﷺ بَعْدَ ذَلِكَ إِذَا أَتَاهُ جِبْرِيلُ اسْتَمَعَ فَإِذَا انْطَلَقَ جِبْرِيلُ قَرَأَهُ النَّبِيُّ ﷺ كَمَا قَرَأَهُ.