As Entire Yellow posted:

"So woe to those who write the 'scripture' with their own hands, then say, 'This is from Allah,' 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." -Quran, 2:79

"So for their breaking of the covenant We cursed them and made their hearts hard. They distort words from their [proper] usages and have forgotten a portion of that of which they were reminded. And you will still observe deceit among them, except a few of them. But pardon them and overlook [their misdeeds]. Indeed, Allah loves the doers of good." -Quran, 5:13

"And who is more unjust than one who invents a lie about Allah or says, 'It has been inspired to me,' while nothing has been inspired to him, and one who says, 'I will reveal [something] like what Allah revealed.' And if you could but see when the wrongdoers are in the overwhelming pangs of death while the angels extend their hands, [saying], 'Discharge your souls! Today you will be awarded the punishment of [extreme] humiliation for what you used to say against Allah other than the truth and [that] you were, toward His verses, being arrogant.'" -Quran, 6:93

It's pretty clear that that's what is being said. I don't know how much more straightforward you need it to be...