Surah Al-A'raf 7:204

وَإِذَا قُرِئَ ٱلْقُرْءَانُ فَٱسْتَمِعُوا۟ لَهُۥ وَأَنصِتُوا۟ لَعَلَّكُمْ تُرْحَمُونَ

So when the Qur’ān is recited, then listen to it and pay attention that you may receive mercy.

Translation: Saheeh International

Tafsir

And when the Qur’ān is recited listen to it and pay heed refraining from speech so that you might find mercy this was revealed regarding the requirement of refraining from speech during the mosque sermon which here has been expressed by the recital of ‘the Qur’ān’ because it the sermon comprises it; …

Excerpt from Tafsir al-Jalalayn, commentary on 7:204, via Quran.com. The reader has the full commentary and 9 more tafsirs.