Al-Jinn 72:9

Waanna kunna naqAAudu minhamaqaAAida lissamAAi faman yastamiAAi al-anayajid lahu shihaban rasada

And we used to sit therein in positions for hearing, but whoever listens now will find a burning flame lying in wait for him.

and that we used to sit at places therein to listen; but if one will (try to) listen now, he will find a flame in ambush for him,