What is the ruling on a woman whose husband has died leaving her, departing from her home before the completion of her iddah due to the death of her brother, and what expiation is incumbent upon her after 13 years have passed since the incident?

A woman observing the 'iddah (waiting period) after her husband's death must remain in her husband's house until the end of her 'iddah. She is permitted to go out during the day for condolences or similar purposes, provided she returns to sleep in her home. Therefore, she must repent and seek forgiveness, and there is no expiation required of her.