Bill Warns Harry About the Dangers of Bargaining with Goblins

After Lupin's departure, Bill Weasley pulls Harry aside for a private conversation. Bill warns Harry about making deals with goblins, explaining that goblins have different views on ownership and treasure, believing that the rightful owner of any object is its maker. Bill advises Harry to be cautious with any promises made to Griphook, as breaking a promise to a goblin could be more dangerous than breaking into Gringotts Wizarding Bank itself.