فَضَرَبْنَا عَلَى آذَانِهِمْ فِي الْكَهْفِ سِنِينَ عَدَدًا
[18:11]
So We prevented them from hearing in the cave for a number of years.
Then We draw (a veil) over their ears, for a number of years, in the Cave, (so that they heard not):
Then We sealed up their hearing in the Cave for a number of years.