The Qur'an is the Speech of Allah

Allah swears by His creation, in which some of His signs can be seen in His creatures. These also indicate the perfection of His Names and Attributes. He then swears by the hidden things that they cannot see. This is an oath swearing that the Qur'an is His Speech, His inspiration and His revelation to His servant and Messenger, whom He chose to convey His Message, and the Messenger carried out this trust faithfully. So Allah says,

فَلاَ أُقْسِمُ بِمَا تُبْصِرُونَ - وَمَا لاَ تُبْصِرُونَ - إِنَّهُ لَقَوْلُ رَسُولٍ كَرِيمٍ

فَلَا أُقْسِمُ بِمَا تُبْصِرُ‌ونَ وَمَا لَا تُبْصِرُ‌ونَ (I swear by what you see, and what you do not see….69:38-39). This comprehends the entire body of creation. Some say 'what you do not see' refers to the Being of Allah Ta` ala and His attributes. Others say 'what you see' refers to things of the mortal world, and 'what you do not see,' refers to things of the Hereafter. [ Mazhari ] And Allah, the Pure and Exalted, Knows best!