Tafsir of Az-Zumar 39:1

The Order for Tawhid and the Refutation of Shirk Allah tells us that the revelation of this Book, which is the magnificent Qur'an, is from Him, and is truth in which there is no doubt whatsoever. This is like the Ayat:

وإنه لتنزيل رب العلمين

نزل به الروح اﻻمين

على قلبك لتكون من المنذرين

بلسان عربى مبين

And truly, this is a revelation from the Lord of the creatures, which the trustworthy Ruh (Jibril) has brought down upon your heart that you may be (one) of the warners, in the plain Arabic language. (26:192-195)

إن الذين كفروا بالذكر لما جاءهم وإنه لكتب عزيز

ﻻ يٲتيه البطل من بين يديه وﻻ من خلفه تنزيل من حكيم حميد

And verily, it is a mighty Book. Falsehood cannot come to it from before it or behind it, (it is) sent down by the All-Wise, Worthy of all praise. (40: 41-42) And Allah says here:

تنزيل الكتاب من الله العزيز الحكيم

The revelation of this Book is from Allah, the Almighty, meaning, the Almighty, All-Powerful

الحكيم

(the All-Wise). meaning, in all that He says, does, legislates and decrees

إنا أنزلنا إليك الكتاب بالحق فاعبد الله مخلصا له الدين