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 waters should sink down into the ground so that you are unable to find it.