Surah Al-A'raf (The Heights), Verse 204

وَاِذَا قُرِئَ الْقُرْاٰنُ فَاسْتَمِعُوْا لَهٗ وَاَنْصِتُوْا لَعَلَّكُمْ تُرْحَمُوْنَ ۟

Wa izaa quri'al Quraanu fastami'oo lahoo wa ansitoo la 'allakum turhamoon

“When the Qur'an is read, listen to it with attention, and hold your peace: that ye may receive Mercy.”

Quran 7:204 (Yusuf Ali Translation)