Why are you in possession of a koran or a bible? I doubt you are a muslim or christian cos you would have known what to do with them. Actually even a hardcover book's inner pages should be soft enough to wipe one's ass with it unless it's those type of books with the hard pages but such books are usually very thin and are mostly children's books with little content. Most encyclopedias for eg that are hard covers might have a tough cover but the inner pages are soft. Just tear off the pages.