How to reconcile Allah’s saying, “We have not neglected in the Book anything,” with the statement that there is in the science of hadith what is not in the Qur’an?

Question:
What is the meaning of Allah’s saying, , and His saying in the other verse, “an explanation of all things”? And do we confront with this those who say that there is in the hadith and revelations what is not in the Qur’an? How do we reconcile this and that? May Allah reward you with good.

Answer:
As for His saying, (Exalted and Majestic is He), , they said this is the Preserved Tablet. That everything is written in the Preserved Tablet, what has happened and what is happening. Allah is the Greatest. It is written in the Preserved Tablet. It is the Book, the great, general, comprehensive Book in which the destinies of the creation are written until the Hour stands. No, no, no. And the other verse: “an explanation of all things.”
Yes, the Qur’an is an explanation of all things that people need in their matters of worship and creed. It has not left anything that people need in their matters of worship, creed, transactions, conduct, and morals without explaining it. Alongside it is the Prophetic Sunnah, for it explains and clarifies the Qur’an.
As for the matters of this world, crafts, and trades, people grasp these through their experiences and their understanding. The discussion is about matters that people cannot grasp with their minds and understanding: matters of creed, matters of worship, matters of transactions—what is lawful and what is forbidden, matters of marriage, matters of conduct and morals. What Allah is pleased with from them, what Allah is pleased with from us, and what He is not pleased with. People do not grasp this except through revelation: the revelation sent down to the Messenger (peace and blessings be upon him), the Qur’an, and the explanation of the Messenger (peace and blessings be upon him).