18:41

Al-Kahf 18:41

أَوْ يُصْبِحَ مَآؤُهَا غَوْرًۭا فَلَن تَسْتَطِيعَ لَهُۥ طَلَبًۭا

Aw yusbiha maaa'uhaaa ghawran falan tastatee'a lahoo talabaa

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