Al Kahf, 41 Ayah
18:41
أَوۡ يُصۡبِحَ مَآؤُهَا غَوۡرٗا فَلَن تَسۡتَطِيعَ لَهُۥ طَلَبٗا ٤١
'Aw Yuşbiĥa Mā'uuhā Ghawrāan Falan Tastaţī`a Lahu Ţalabāan
Or its water will become sunken [into the earth], so you would never be able to seek it."