Two examples prohibit raising the voice or speaking loudly in a particular manner.
لَا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ
Do not raise your voices above the Prophet's voice.
لَا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ
Do not speak loudly to him as you speak loudly to one another.
Both verbs lose inflectional nūn: تَرْفَعُونَ ← تَرْفَعُوا, تَجْهَرُونَ ← تَجْهَرُوا.
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The Prohibitive: Negation, Prohibition and Jussive Endings
Two examples prohibit raising the voice or speaking loudly in a particular manner.
لَا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ
Do not raise your voices above the Prophet's voice.
لَا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ
Do not speak loudly to him as you speak loudly to one another.
Both verbs lose inflectional nūn: تَرْفَعُونَ ← تَرْفَعُوا, تَجْهَرُونَ ← تَجْهَرُوا.