I mean its literally right at the beginning in Surah 2:75 and 2:79, which is why I remember:

Do you covet [the hope, O believers], that they would believe for you while a party of them used to hear the words of Allāh and then distort it [i.e., the Torah] after they had understood it while they were knowing?

So woe to those who write the scripture with their own hands, then say, This is from Allāh, in order to exchange it for a small price. Woe to them for what their hands have written and woe to them for what they earn.

• So the words of allah, such as the Gospel cannot be corrupted. So if the Gospel was corrupted, Islam is false. If the Gospel wasn't corrupted then it doesn't "confirm" the Qur'an at all, so Islam is false. This is the Islamic Dilemma.

Is such a weird argument that makes no sense from what you just provided. AFAIK the quote you gave is talking about "words of Allah", which indicates his power and decree, ie everything that happens is because of him, and it will happen. Nowhere does it imply that his revelation cannot be altered by humans.

I would talk about the Qur'an also explicitly stating about its superceded position, but you quoted your first quote wrong:

Surah 4:57 is:

But those who believe and do righteous deeds - We will admit them to gardens beneath which rivers flow, wherein they abide forever. For them therein are purified spouses, and We will admit them to deepening shade.

So I'm not really sure which quote you meant to use.

As for the 7 versions, those were specific subdialects on how the pronunciation slightly changed that you can still find today but no one uses since they decided to standardize on one when writing it during the first caliphate iirc.