[pinkpanther]

That is a wrong understanding of the Quran. 

I've explained to you already. This is regarding revelations, not the content of the revelation. The pagan Arabs of Makkah were skeptical that Allah would communicate to mankind via revelations, which we know as scriptures. So Allah asks them to check with the children of Israel, who have been receiving revelations from Allah for more than a thousand years already.

 
You are a disbeliever of your Quran..
How can the Quran verify previous scriptures and yet chose to disbelieve them ...you lot are confused

Confirmation of Original Texts:

The Quran also states that it verifies the Taurat (Torah) and Injil (Gospel) that the Jews and Christians possess. This implies that the scriptures, in their original form, were still valid and authentic during the time of Muhammad.