What phrase opens the Harry Potter books’ Marauder’s Map?
Answer
I solemnly swear that I am up to no good
The phrase that opens the Marauder’s Map in the Harry Potter books is “I solemnly swear that I am up to no good.”
The enchanted map reveals every corridor, room, and person within Hogwarts, including secret passages and moving footprints. It can be activated only by speaking the phrase, after which its magical ink and labels appear on the parchment.
The map was created by four Hogwarts students who called themselves Moony, Wormtail, Padfoot, and Prongs. Their real identities were Remus Lupin, Peter Pettigrew, Sirius Black, and James Potter. Fred and George Weasley steal it from Filch’s office and later give it to Harry.
To hide the map again, the user says “Mischief managed.” These two phrases are often confused because one reveals the map and the other closes it.