Do not raise your voices above the voice of the Prophet

Allah (tabaarak ta wa ta’aala) says in His Noble Book:

“O you who have believed, do not put [yourselves] before Allah and His Messenger, but fear Allah . Indeed, Allah is Hearing and Knowing.” [al-Ḥujurat 49:1]

Concerning this verse, al-Awfi stated: "He forbade them from speaking during His speech." (Tafsir Ibn Kathir)

It is also known that whenever Imam Malik ibn Anas, the Imam of Dar al-Hijrah (rahimahullaah), would begin his lessons of Ḥadith, if anyone was talking, he would censure and rebuke them by reciting the statement of Allah (Jalla Jalaaluhu): "O you who have believed, do not raise your voices above the voice of the Prophet." [al-Ḥujurat 49:2] 

Some scholars have stated that the person who talks over the narration of the Prophet’s (peace be upon him) Ḥadith, it is as if they are talking directly over him.

The sittings of knowledge - most specifically those which take place in the masajid - should be held in reverence and honor of the texts and narrations being recited. Are we not aware of the conduct of the companions of the Prophet (peace be upon him) in such circumstances? In the authentic narration collected by Imam Aḥmad in his Musnad on the authority of al-Bara ibn Azib (radhiAllaahu anhu), who said: 

" …He (i.e. the Prophet) sat, and [the companions] sat around him; it was as if there were birds on their heads." The saying "as if there were birds on their heads" is a way of describing how quiet and still they were, quiet and still as statues. 

The noble scholar Shaykh Muḥammad ibn Ṣaliḥ al-Uthaymin (rahimahullaah) stated: "[This was] out of respect for the Messenger of Allah(peace be upon him) and in honor of the venerableness of this sitting." (Sharḥ Riyaḍ al-Ṣaliḥin)