Surah Al-Kahf · The Cave · Verse 41/110

Qur'an 18:41

أَوْ يُصْبِحَ مَآؤُهَا غَوْرًۭا فَلَن تَسْتَطِيعَ لَهُۥ طَلَبًۭا

Or its water will become sunken [into the earth], so you would never be able to seek it."

Quran 18:41 — Al-Kahf (الكهف)