سورة Al-Ahqaf ( The Curved Sand-hills ) - الآية 29

And call to mind when We sent to you a party of the jinn that they may listen to the Qur'an. When they reached the place (where you were reciting the Qur'an), they said to one another: “Be silent (and listen).” And when the recitation ended, they went back to their people as warners.