Every word of God is flawless;. he is a shield to those who take refuge in him. (Proverbs 30:5)
2 Timothy 3:16 states that "All Scripture is inspired by God." The term "inspired" here is not used in the sense of "Beethoven was inspired to write great symphonies." It literally means "God-breathed." This applies to the entire Bible, and extends to the actual words, not just the concepts ("all Scripture"). Jesus also affirmed this for the Old Testament (Matt. 5:18) and promised this for the New Testament (John 16:12-15; 14:26).
Since God always speaks the truth, it follows that the Scriptures are without error. Jesus treated them this way, even basing his point in an argument with the Pharisees on the tense of a single word (Matthew 22:31-32; see also Galatians 3:16 where Paul does this as well) and stating "the Scripture cannot be broken" (John 10:35). This is called the doctrine of verbal, plenary inspiration, which means that the very words (verbal) of the Bible were all (plenary) God-breathed.
The Holy Qur'an cannot contain errors, simply for these three reasons:
1. God (Allah) Revealed It:
Allah says (interpretation of the meaning): " Verily, those who disbelieved in the Reminder (i.e. the Qur'an) when it came to them (shall receive the punishment). And verily, it is an honorable respected Book. Falsehood cannot come to it from before it or behind it (it is) sent down by the All-Wise, Worthy of all praise (Allah)." (Qur'an 41:41-42)
Allah also says (interpretation of the meaning): " All the praises and thanks be to Allah, Who has sent down to His slave [Muhammad (pbuh)] the Book (i.e. the Qur'an), and has not placed therein any crookedness. (He has made it) Straight..." (Qur'an 18:l-2)
He also says (interpretation of the meaning): " Allah has sent down the best statement, a Book (this Qur'an), its parts resembling each other in goodness and truth, oft-repeated." (Qur'an 39:23)
2. Allah Preserves It:
Allah has promised to always preserve His book. He says (interpretation of the meaning): " Verily We: It is We Who have sent down the Dhikr [Reminder (the Qur'an)] and surely, We will guard it (from corruption)." (Qur'an 15:9)
The Qur'an 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 Qur'an prepared 1400 years ago still exist today. One is in the Topkapi Sarav Museum in Istanbul, Turkey, and the other in Tashkent, Uzbekistan. Both of these are identical in content with the Qur'an available all over the world today.
3. You Can Examine It:
Allah says (interpretation of the meaning): "Do they not then consider the Qur'an carefully? Had it been from other than Allah, they would have found therein much contradictions." (Qur'an 4:82)
Here Allah challenges people to find an error in the Qur'an. If it contains errors then it cannot be from Allah. If, on the other hand, it had been the production of a human being, it would definitely contain errors.