What is the ruling on maintenance if a wife observes an unrestricted vow (nadhr mutlaq) or a fast of atonement (kaffarah)?
Chapter on the Condition in which Maintenance is Obligatory on the Husband
Al-Mughni
Book of Maintenance (Nafaqāt)
Primary text
If the wife fasts for an unrestricted vow or atonement with the husband's permission, she is entitled to maintenance because she performed an obligation with his consent, resembling the case of fulfilling a specific fast during its appointed time.
Supporting text
If she observes it without his permission, Al-Qadi rules that she forfeits maintenance because she could have postponed it, as these fasts are generally non-urgent (ala al-tarākhi), whereas the husband's right requires immediate fulfillment (ala al-fawr).