It says...
It says: “And that which We have revealed to you of the Book, it is the truth verifying that which is before it, verily Allah, about His servants, is Aware, Seeing.” Regarding this fact that ‘truth’ is in the sense of something which adapts the reality and is consistent with it, this meaning is a reasoning for proving this idea that this heavenly Book has been sent down from the side of Allah, because the more we are careful in its content the more we find it consistent with realities.
There is no contradiction in it; no falsehood or superstition is found in it; its beliefs and knowledge are consistent with the logic of wisdom; its statements about the ancient events are far from myths and legends; and its laws agree with the needs of human beings. This legitimacy is a clear proof upon this fact that it has been sent down from the side of Allah. The holy sentence which says: “… verifying that which is before…