The noble Qur'an is God's word, which He revealed to His Prophet Muhammad - peace and blessings of Allah be upon him - through the angel Gabriel. The word “Qur'an” or “Koran” is derived from the Arabic verb “qara’a” that means “he read”. For the Muslims it is the first and most important source of law and the last revelation of God to the people. It is divided into 114 chapters, so-called "Surah", of which the shortest has three verses and the longest 286 verses. The Qur'an was revealed in Arabic and has been preserved unadulterated to date. In the Qur'an, God Himself guarantees that He will protect it from adulteration: "Verily, We, it is We Who have sent down the Dhikr (i.e., the Quran) and surely, We will guard it (from corruption) " (Surah 15: Verse 9).
One of the central contents of the Qur'an is the emphasis on God's unity and His omnipotence. It also contains stories of the prophets as well as stories of past peoples, rules and prohibitions, laws and solutions to political and social problems. In many verses there are references to Judgment Day, Paradise and Hell. Studying the Qur'an, as well as the hadith, ideally leads to an improvement in character and an exemplary Islamic lifestyle.
The linguistic beauty of the Qur'an is unique; therefore, the Qur'an is also considered a miracle of God. He even calls on people to produce only one single surah of the same kind - which, however, no one has been able to and will never ever be able to. "And if you are in doubt concerning that which We have sent down (i.e., The Quran) to Our slave Muhammad peace and blessings of Allah be upon him, then bring a surah (Chapter) of the like thereof and call your witnesses besides Allah, if you are truthful" (Surah 2: Verse 23).
The fact that Prophet Muhammad peace and blessings of Allah be upon him, was illiterate is also an evidence that the Qur'an is God's word. All prophets were given miracles by God, but these were limited in time, whereas the Qur'an has been around for over 1400 years and will remain forever. It is thus the greatest miracle of God.
The revelation of the Qur'an took place over a period of 23 years, and yet there are no contradictions in it.
The Qur'an addresses some phenomena of which the people of the Arabian Peninsula could not have known in the seventh century, or which have even only recently been confirmed by science, such as the development of the embryo.
" O mankind! If you are in doubt about the Resurrection, then verily! We have created you (i.e. Adam) from dust, then from a Nutfah (mixed drops of male and female sexual discharge i.e. offspring of Adam), then from a clot (a piece of thick coagulated blood) then from a little lump of flesh, some formed and some unformed (miscarriage), that We may make (it) clear to you (i.e. to show you Our Power and Ability to do what We will). And We cause whom We will to remain in the wombs for an appointed term, then We bring you out as infants, then (give you growth) that you may reach your age of full strength. And among you there is he who dies (young), and among you there is he who is brought back to the miserable old age, so that he knows nothing after having known. And you see the earth barren, but when We send down water (rain) on it, it is stirred (to life), it swells and puts forth every lovely kind (of growth)."(Surah 22: Verse 5).
Surah 36, Verses 38-40, is about the orbits of the sun and moon: "And the sun runs on its fixed course for a term (appointed). That is the Decree of the All-Mighty, the All-Knowing (38). And the moon, We have measured for it mansions (to traverse) till it returns like the old dried curved date stalk (39). It is not for the sun to overtake the moon, nor does the night outstrip the day. They all float, each in an orbit (40)".
It is also mentioned that the mountains are firmly anchored in the ground (Surah 21: Verse 31), that honey is only made by female bees (Surah 16: Verses 68-69) and that there are living beings that humans do not know about (Surah 16 :Verse 8) - to name just a few examples.
In addition, the Qur'an makes some predictions about future events, for example in Surah 30, verses 1-4, the imminent victory of the Byzantines is reported, although they were severely weakened at that time. Indeed, a few years later they triumphed over the Persians.