الحجرٰت — Al-Hujurat Ayat 2
يٰٓاَيُّهَا الَّذِيْنَ اٰمَنُوْا لَا تَرْفَعُوْٓا اَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ وَلَا تَجْهَرُوْا لَهٗ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ اَنْ تَحْبَطَ اَعْمَالُكُمْ وَاَنْتُمْ لَا تَشْعُرُوْنَ
Yā ayyuhal-lażīna āmanū lā tarfa‘ū aṣwātakum fauqa ṣautin-nabiyyi wa lā tajharū lahū bil-qauli kajahri ba‘ḍikum liba‘ḍin an taḥbaṭa a‘mālukum wa antum lā tasy‘urūn(a).
"O you who have believed, do not raise your voices above the voice of the Prophet or be loud to him in speech like the loudness of some of you to others, lest your deeds become worthless while you perceive not."