Al-Hujurat (The Private Apartments)

Surah 49 · Verse 3

Those who lower their voices in the presence of the messenger of Allah, are certainly those whose hearts Allah has cleared for (receiving the quality of) guarding (against evil), for them there is protective forgiveness and a great reward.

إِنَّ الَّذِينَ يَغُضُّونَ أَصْوَاتَهُمْ عِنْدَ رَسُولِ اللَّهِ أُولَٰئِكَ الَّذِينَ امْتَحَنَ اللَّهُ قُلُوبَهُمْ لِلتَّقْوَىٰ ۚ لَهُمْ مَغْفِرَةٌ وَأَجْرٌ عَظِيمٌ