إِنَّ الَّذِينَ يَغُضُّونَ أَصْوَاتَهُمْ عِندَ رَسُولِ اللَّهِ أُوْلَئِكَ الَّذِينَ امْتَحَنَ اللَّهُ قُلُوبَهُمْ لِلتَّقْوَى لَهُم مَّغْفِرَةٌ وَأَجْرٌ عَظِيمٌ
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سورة الحُـجُـرات
(49/3) Verily those who lower their voices in the presence of the apostle of Allah -those are they whose hearts Allah hath disposed Unto piety: theirs will be forgiveness and a mighty hire.
Surah Al-Hujurat