O owners of the book! Our messenger has come to you making clear to you much of that which you used to hide from the book and passing over (or exempting) much. There has indeed come to you a light and a clear book from Allah.
Owners of the earlier Divine books are invited to follow Prophet Muhammed (PBH) who has been sent with the Quran which clears many things they were hiding and brings people, who please Allah (SWT), out from darkness towards light leading to paradise. In this sense the Quran is called a book that clarifies and a light.