يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ وَلَا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ أَن تَحْبَطَ أَعْمَالُكُمْ وَأَنتُمْ لَا تَشْعُرُونَ
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سورة الحُـجُـرات
(49/2) O you who believe (who wish to reach Allah)! Do not raise your voices above the voice of the Prophet, and do not speak loud to him as you speak loud to one another, lest your deeds should become null while you do not perceive.
Surah Al-Hujurat