Abu Ja’far Mansoor, the Muslim ruler, was once engaged in a discussion with Imaam Maalik (rahimahullah) in the Musjid of Rasulullah (sallallahu ‘alaihi wasallam). During the course of the discussion, Abu Ja’far raised his voice. As soon as he did this, Imaam Maalik (rahimahullah) cautioned him saying, “O Ameerul Mu’mineen! Do not raise your voice in this Musjid, for Allah Ta‘ala corrected one group of people and taught them respect and etiquette saying,

لَا تَرۡفَعُوۡۤا اَصۡوَاتَکُمۡ فَوۡقَ صَوۡتِ النَّبِیِّ

‘Do not raise your voices above the voice of the Nabi (sallallahu ‘alaihi wasallam)’