Those who lower their voices in the presence of Allah's Messenger

 إِنَّ ٱلَّذِينَ يَغُضُّونَ أَصْوَٰتَهُمْ عِندَ رَسُولِ ٱللَّهِ أُو۟لَـٰٓئِكَ ٱلَّذِينَ ٱمْتَحَنَ ٱللَّهُ قُلُوبَهُمْ لِلتَّقْوَىٰ ۚ لَهُم مَّغْفِرَةٌۭ وَأَجْرٌ عَظِيمٌ ٣

Verily, those who lower their voices in the presence of Allah's Messenger (صلى الله عليه وسلم), they are the ones whose hearts Allah has tested for piety. For them is forgiveness and a great reward.

Quran 49:3