فَضَرَبْنَا عَلَىٰٓ ءَاذَانِهِمْ فِى ٱلْكَهْفِ سِنِينَ عَدَدًا

Fadarabna AAala athanihimfee alkahfi sineena AAadada

So We cast [a cover of sleep] over their ears within the cave for a number of years.