Al-Kahf 18:41
أَوْ يُصْبِحَ مَاؤُهَا غَوْرًا فَلَن تَسْتَطِيعَ لَهُ طَلَبًا ٤١
Aw yusbiha maoha ghawran falan tastateeAAa lahu talaban
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or in the morning the water of it will be sunk into the earth, so that thou wilt not be able to seek it out.’ (18:41)