The Prophethood of Muhammad, on whom be peace, was to be valid until the Last Day. It was imperative, therefore, that his miracle also be one which would last for all time. The Qur’an was, therefore, assigned to the Prophet as his everlasting miracle.
There are many different aspects of the Qur’an’s miraculous nature
1-The Quran, which he brought, has challenged all mankind with all their literary geniuses and scientists, from the first day of its revelation to the Last Day, to produce a like of it or even a single chapter of it
2-The Quran was revealed in 23 years, yet there are not any contradictory points in it
3-The Quran is completely different from all the other books in the world . one which is a book of Divine truths, metaphysics, religious beliefs and worship, prayer, law and morality, a book fully describing the other life, a book of psychology, sociology, epistemology, and history, and a book containing scientific facts and the principles of a happy life, does not have any contradictory points. Whereas, the Quran openly declares that it has no contradictions at all and therefore is a Divine Book:
4-The Quran is beyond compare from the viewpoint of its styles and eloquence. All the sentences, words and even letters used in the Quran form such a miraculous harmony that, with respect to rhythm, music, and even geometric proportions and mathematical measures, and with respect to how many times each is used in the whole of the Quran, each is in the exact place it must be and interwoven and interrelated with others. The literary masterpiece of no one, including the sayings of the Prophet himself, upon him be peace and blessings, cannot compete with the Quran.
4-In the period when the Quran was revealed, in addition to eloquence, poetry and oratory enjoyed great prestige in the Arabian peninsula. They used to hold poetry competitions and the poems of the winners write in gold and hang on the wall of the Ka‘ba. The Prophet Muhammad was, as everybody knows, unlettered and no one had heard him say even a couple of poetry. However, the Quran also challenged the known experts in these fields and forced them to surrender. When those who persisted in unbelief heard the Quran, they were captivated by it. Nevertheless, in order to prevent the spread of Islam, they labeled it as something magical and advised people not to listen to it. But when those, like Hansa and Lebid, who believed in the Quran, gave up inventing poetry after the Quran’s revelation in respect for and awe of its styles and eloquence, the unbelievers had to confess: ‘If we call it a piece of poetry, it is not. If we designate it a piece of rhymed prose, it is not. If we describe it as the word of a soothsayer, it is not.’ At times, they could not help listening to the Prophet’s recitation secretly at night but they could not overcome their arrogance and so believe in its Divine origin.
5-Despite its apparent simplicity, the Quran has such depths of meaning that everyone from the commonest of people to the most high-ranking scholar, scientist and literary man, finds his share in it
6-No one has ever been heard to be bored with the recitation of the Quran
7-The Quran unveils the mystery of man, creation and the universe
8-Even though revealed in parts on certain occasions, the Qur’an is equally universal and objective where it deals with particular issues as it is exact and precise where it deals with universal matters
9-The Qur’an contains at least the principles of all the branches of knowledge either in summary or detail and not even a single piece of the knowledge it contains has ever been contradicted.
10-Which writer can claim that whatever he writes is absolutely correct and cannot be contradicted until the Last Day?
11-However knowledgeable you are and if you are famous for your truthfulness, can you speak on behalf of the president, the prime minister and all of the ministers, and also on behalf of the associations of literary men, lawyers and craftsmen, and the board of university lecturers and scientists? If you can, can you claim that you represented them all as perfectly as each would want you to? If you can, can you legislate for all the affairs of the country? This is just what the Prophet achieved through the Qur’an.
and there are more