Here's the reference, from the book itself: Nahl, 89: And We have sent down to you the Book as clarification for all things and as guidance and mercy and good

Here's the reference, from the book itself: Nahl, 89: And We have sent down to you the Book as clarification for all things and as guidance and mercy and good tidings for the Muslims. And here they went, they set fire on Big libraries of Egypt and Iran, thousands of years of knowledge went to drain simply becasue the book has knowledge about everything!