What is the reason for calling the sky and the earth to witness in the Holy Quran?
The Holy Quran has, at another place, recited such an oath for the purpose of citing an instance of the law of nature in support of the phenomenon of revelation and has said: We call to witness the heaven that sends down rain and the earth that sprouts diverse types of vegetation with the help of such rain, that the Quran is God's word and His revelation, and that it decides between the truth and falsehood and is not vain talk, that is to say, it has not been revealed out of time and has come like seasonable rain (86:12-15).
Here God Almighty has set forth a well known law of nature in support of the truth of the Holy Quran, which is His Word. It is a matter of common observation that at a time of need rain comes down from heaven and that the vegetation of the earth all depends upon rain. When rain is held back then gradually the wells also run dry, so that the water in the earth also depends upon rain from heaven. That is how in the rainy season the level of water in the wells also arises, the reason for which is that heavenly water exercises a pull upon earthly water. The same is the relationship between divine revelation and human reason. Divine revelation is heavenly water and reason is earthly water which receives sustenance from heavenly water. When heavenly water, that is to say divine revelation, is held back, the earthly water also dries up gradually. That is the reason why, when a long time passes and no recipient of revelation appears on the earth, the reason of the wise is corrupted, as earthly water is corrupted and dries up. To appreciate this phenomenon it would be enough to cast a glance at the condition of the world immediately before the advent of the Holy Prophet, peace and blessings of Allah be upon him. As six hundred years had passed after the time of Jesus, and no recipient of revelation had appeared during the interval, the whole world had been corrupted. The history of every country shows that before the advent of the Holy Prophet, peace and blessings of Allah be upon him.
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