Surah Al-Kahf — Ayah 11 (18:11)
فَضَرَبۡنَا عَلَىٰٓ ءَاذَانِهِمۡ فِي ٱلۡكَهۡفِ سِنِينَ عَدَدٗا ١١
English translation (Saheeh International)
So We cast [a cover of sleep] over their ears within the cave for a number of years.
Brief commentary
Then after they went and took refuge in the cave, I put a barrier on their ears from hearing, and I put them to sleep for many years.