If someone vowed to set aside a tithe of his income and used that money for personal needs, must he repay it afterward?

This source-based Torah study examines the question: If someone vowed to set aside a tithe of his income and used that money for personal needs, must he repay it afterward? It follows the canonical Hebrew discussion through the weekly Torah portion and the Jewish sources cited there. This localized discovery layer is a concise abstract, not a full translation and not a practical ruling. Any halakhic, medical, legal, security, bereavement, political or other sensitive claim remains subject to the canonical review status and should not be treated as individualized advice.