Indeed, We have sent down the Dhikr [the Qur‘ān], and indeed We are its guardian. (15:9)
In this verse Allāh ta‘ālā proclaims that it is He, and He alone, who has revealed the Glorious Qur’ān to mankind, which means it is His Word. This claim is followed by a proof to validate it: that Allāh ta‘ālā Himself is its guardian and protector. When Allāh ta‘ālā protects something, nothing and no one can ever interfere with it, so the continual preservation of the Qur’ān is a proof that it is the Word of Allāh ta‘ālā. There are many other proofs of the Divine origin of the Qur’ān, including its i‘jāz (inimitability) – the challenge to mankind to invent even a single verse to match the Qur’ān in its perfection. However, the preservation of the Qur’ān is a proof that even a child can understand. More...