Súra 18 Al-Kahf (The Cave), ájet 41

  1. أَوْ يُصْبِحَ مَاؤُهَا غَوْرًا فَلَنْ تَسْتَطِيعَ لَهُ طَلَبًا

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

    18:41

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