Moony, Wormtail, Padfoot, and Prongs,” sighed George, patting the heading of the map. “We owe them so much.”“Noble men, working tirelessly to help a new generation of lawbreakers,” said Fred solemnly.“Right,” said George briskly. “Don’t forget to wipe it after you’ve used it —”“— or anyone can read it,” Fred said warningly.[Prisoner of Azkaban, Chapter 10]