7:204
وَإِذَا قُرِئَ ٱلْقُرْءَانُ فَٱسْتَمِعُوا۟ لَهُۥ وَأَنصِتُوا۟ لَعَلَّكُمْ تُرْحَمُونَ
wa-idhā quri-a l-qur'ānu fa-is'tamiʿū lahu wa-anṣitū laʿallakum tur'ḥamūna
so pay attention and listen quietly when the Quran is recited, so that you may be given mercy.’
So, when the Qur’ân is recited, listen to it, and be silent that you may receive mercy. [i.e. during the compulsory congregational prayers when the Imâm (of a mosque) is leading the prayer (except Sûrat Al-Fâtihah), and also when he is delivering the Friday-prayer Khutbah]. (Tafsir At-Tabari).