Know they not that Allah knoweth what they conceal and what they reveal?
And there are among them illiterates, who know not the Book, but (see therein their own) desires, and they do nothing but conjuncture.
Then woe to those who write the Book with their own hands, and then say: “This is from Allah,” to traffic with it for a miserable price! – woe to them for what their hands do write, and for the gain they make thereby.
And they say: “The fire shall not touch us but for a few numbered days:” say: “Have ye taken a promise from Allah, for He never breaks His promise? Or is it that ye say of Allah what ye do not know?
Nay, those who seek gain in evil, and are girt round by their sins– they are companions of the fire: therein shall they abide (forever).
Al-Quran 2 (77-81)