بسم الله الرحمن الرحيم
In the Name of Allah, Most Gracious, Most Merciful
Why God’s Book Cannot Contain Error
1> God Revealed it
Those who disbelieve in the Reminder when it comes onto them (are guilty), for indeed it is an unassailable Scripture. Falsehood cannot come at it from before it or behind it. (It is) a revelation from the Wise, the Owner of Praise (Quraan 41:41-42).
Praise be to Allah Who has revealed the Scripture unto His slave, and has not placed therein any crookedness (but has made it) straight (Quraan 18:1-2).
Allah has (now) revealed the fairest of the statements, a Scripture consistent (Quraan 39:28).
2> God Preserves it
God has promised to always preserve His book. He says:
Surely We, even We, revealed the Reminder (the Quraan), and We verily are it’s Guardian (Quraan 15:9).
The Quraan contains no additions. It remains today letter for letter as it was revealed over 1400 years ago. Nothing added, nothing taken away.
Two of the original manuscripts of the Quraan prepared 1400 years ago still exists today. One is in the Topkapi Saray Museum in Istambul, Turkey, and the other in Tashkent, Russia. Both of these are identical in content with the Quraan available all over the world today.
3> You Can Examine it
Will they not then consider the Quraan with care? If it had been from other than Allah they would have found therein much discrepancy (Quraan 4:82).
Here God challenges people to find an error in the Quraan. If it contains errors then it cannot be from God. If, on the other hand, it had been the production of a human being it would definitely contain errors. A human writer 1400 years ago would have written on the basis of the level of knowledge of his or her day. And many of those ideas would turn out to be false later as humankind learns more, especially in the field of science. But the Quraan is remarkably free of error.
People Changed the Old Scriptures
including the Bible:
It is the People who Changed the Old Scriptures including the Bible as mentioned in the Quraan:
But those who were unjust changed it for a saying other than that which had been spoken to them, so We sent upon those who were unjust a pestilence from heaven, because they transgressed. (Al_Quraan_002:059)
Do you then hope that they would believe in you, and a party from among them indeed used to hear the Word of Allah, then altered it after they had understood it, and they know (this). (Al_Quraan_002:075)
Whoever then alters it after he has heard it, the sin of it then is only upon those who alter it; surely Allah is Hearing, Knowing. (Al_Quraan_002:181)
Of those who are Jews (there are those who) alter words from their places and say: We have heard and we disobey and: Hear, may you not be made to hear! and: Raina, distorting (the word) with their tongues and taunting about religion; and if they had said (instead): We have heard and we obey, and hearken, and unzurna it would have been better for them and more upright; but Allah has cursed them on account of their unbelief, so they do not believe but a little. (Al_Quraan_004:046)
But on account of their breaking their covenant We cursed them and made their hearts hard; they altered the words from their places and they neglected a portion of what they were reminded of; and you shall always discover treachery in them excepting a few of them; so pardon them and turn away; surely Allah loves those who do good (to others). (Al_Quraan_005:013)
But those who were unjust among them changed it for a saying other than that which had been spoken to them; so We sent upon them a pestilence from heaven because they were unjust. (Al_Quraan_007:162)