يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَرۡفَعُوٓاْ أَصۡوَٰتَكُمۡ فَوۡقَ صَوۡتِ ٱلنَّبِيِّ وَلَا تَجۡهَرُواْ لَهُۥ بِٱلۡقَوۡلِ كَجَهۡرِ بَعۡضِكُمۡ لِبَعۡضٍ أَن تَحۡبَطَ أَعۡمَٰلُكُمۡ وَأَنتُمۡ لَا تَشۡعُرُونَ

Yaa ayyuhal lazeena aamanoo laa tarfa'ooo aswaatakum fawqa sawtin Nabiyi wa laa tajharoo lahoo bilqawli kajahri ba'dikum liba 'din an tahbata a 'maalukum wa antum laa tash'uroon

O ye who believe! Raise not your voices above the voice of the Prophet, nor speak aloud to him in talk, as ye may speak aloud to one another, lest your deeds become vain and ye perceive not.

— Al-Hujurat (ٱلحُجُرَات), 49:2