قُلْ أَرَأَيْتُمْ إِنْ أَصْبَحَ مَاؤُكُمْ غَوْرًا فَمَن يَأْتِيكُم بِمَاءٍ مَّعِينٍ (30)
(67:30) Say to them: 'Did you even consider: if all the water that you have (in the wells) were to sink down into the depths of the earth, who will produce for you clear, flowing water?' *40
*40) That is "Has another besides Allah the power to restore these springs of water to you? If none else has this power, and you know fully well that none has it, then who is worthy of worship: God or your false deities, who do not have the power to restore them? Then ask your own selves as to who is misled and misguided: those who believe in One God, or those who believe in many gods."