Al-Hujurat (The Private Apartments)

Surah 49 · Verse 2

O you who believe! do not raise your voices above the voice of the prophet and do not speak aloud to him while talking (to him) as you speak aloud to each other, lest your deeds become fruitless while you do not perceive.

يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ وَلَا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ أَنْ تَحْبَطَ أَعْمَالُكُمْ وَأَنْتُمْ لَا تَشْعُرُونَ