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 some morning the water thereof will be lost in the earth so that thou canst not make search for it.” (18:41)