Ibn Abbas (RA) reported with regard to the words:" Do not move thy tongue there with to make haste," that the Apostle of Allah (ﷺ) felt it hard and he moved his lips. Ibn 'Abbas said to me (Sa'id bin Jubair): I move them just as the Messenger of Allah (ﷺ) moved them. Then said Sa'id: I move them just as Ibn 'Abbas moved them, and he moved his lips. Allah, the Exalted, revealed this: "Do not move your tongue therewith to make haste. It is with Us that its collection rests and its recital" (al-Qur'an, ixxv. 16). He said: "Its preservation in your heart and then your recital. So when We recite it, follow its recital" He said: "Listen to it, and be silent and then it rests with Us that you recite it.". So when Gabriel (ؑ) came to the Messenger of Allah (ﷺ) , he listened to him attentively, and when Gabriel (ؑ) went away, the Apostle of Allah (ﷺ) recited as he ( Gabriel (ؑ)) had recited it.
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary: Vocabulary of the Hadith: (1) MIMMA YUHARRIKU BIHI: “Mimma” here means “a lot”, or the purpose is that moving the tongue became a habit and routine for you (sallallahu alayhi wa sallam).
(2) YU‘RAFU DHALIKA MINHU: The signs of the intensity of revelation would become apparent on your (sallallahu alayhi wa sallam) face, and your hardship would be felt.
(3) YU‘ALIJU MIN AL-TANZIL SHIDDAH: You (sallallahu alayhi wa sallam) had to endure hardship from the descent of revelation, and you (sallallahu alayhi wa sallam) would bear its difficulty.
(4) ISTAMI‘ WA ANSIT: Listen attentively, and adopt silence (quietness).
Benefits and Issues: Just as the Messenger of Allah (sallallahu alayhi wa sallam) was instructed and advised to listen to the Noble Qur’an, in the same way, his (sallallahu alayhi wa sallam) ummah has also been given this advice: that they should listen to the Noble Qur’an attentively. Therefore, in gatherings of Qur’an recitation, one should listen to the Noble Qur’an with full concentration and devotion, and where people are busy with their work and cannot pay attention to the recitation, one should avoid reciting aloud through loudspeakers.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 1005