18:11 fa Darabnaa 'Alaa aadhaanihim fiyl kahfi siniyna 'Adadaa

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Ahmed Raza Khan: Mohammed Aqib Qadri:
We then thumped upon their ears in the Cave for a number of years. (* Put them to sleep.)

Yusuf Ali:
Then We draw (a veil) over their ears, for a number of years, in the Cave, (so that they heard not):

Pickthal:
Then We sealed up their hearing in the Cave for a number of years.