This verse is often cited as a definitive statement on the ontological status of divine revelation. It asserts that once God’s word is delivered, it is perfect in its nature and immune to human interference or subversion.
Surah 6:115:
"And the word of your Lord has been fulfilled in truth and in justice. None can alter His words, and He is the Hearing, the Knowing."
This verse is a cornerstone for the belief that God’s revelation is under His direct protection.
The phrase "None can alter His words" (La mubaddila li-kalimatihi) is frequently used to argue that human beings do not possess the power to fundamentally corrupt or erase what God has decreed.
A significant point of discussion in comparative theology is whether "His words" refers exclusively to the Quran or to the entire category of divine speech (Kalimatullah).
If the "words" refer to all revelations given to the prophets mentioned in the preceding context (Surah 6:83-92), it implies that the Torah, the Psalms, and the Gospel are equally protected by this divine decree.
In this view, the "fulfillment" refers to the specific completion of the Quranic message as the final word.
By ending the verse with "He is the Hearing, the Knowing," the text anchors the preservation of the word to God's attributes.
It suggests that because God hears all attempts to distort the truth and knows the hearts of those who try, His sovereignty ensures the message remains "truthful and just" regardless of human effort.
Surah 6:115 serves as a "Guarantee of Integrity." It presents a world where the Word of God is the ultimate reality—one that is finished (Tammat), accurate (Sidqan), and legally perfect ('Adlan).
For those studying the continuity of scripture, this verse poses a fundamental question: If no one can alter the words of the Lord, does that divine protection extend to the physical books held by the "People of the Scripture" that the Quran frequently confirms?
You can further examine how this concept of "immutability" in Surah 18:27, which uses nearly identical language.