“An Unbreakable Vow?" said Ron, looking stunned. "Nah, he canâ€™t have.... Are you sure?""Yes Iâ€™m sure," said Harry. "Why, what does it mean?""Well, you canâ€™t break an Unbreakable Vow...""Iâ€™d worked that much out for myself, funnily enough.”
— J.K. Rowling,