Surah 18

Surah 18:27

"Recite what you have been inspired (with) of the Book of your Lord. No one can change His words, and you will find no refuge other than Him."

The Quran states that no one can change the words of Allah ( lā mubaddila li-kalimātihi ) as part of an encouragement to the messenger to recite from the Lord’s book. By this point in the Quran, readers have seen this statement in three other verses (6.34, 115; and similarly lā tabdīla li-kalimāti ’ llāh in 10.64). This statement must be taken into account when evaluating the Muslim claim that the Quran accuses the Bible of being corrupt or falsified.

- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam