Is a woman obligated to return the full mahr to her husband after requesting a divorce due to his behavior and obscene remarks? Is it permissible for her to donate the remaining part of it if returning it is not possible? Is her partially false testimony considered slander, and how can she expiate this sin if she cannot communicate with her husband?

First: Do not obligate your relative to return the ten thousand to her ex-husband, as long as the agreement was made to waive it. A divorcée, after consummation, is entitled to the full dowry, and what occurred was a valid khul'.

Second: If the woman attributed false actions and statements to her ex-husband, this is forbidden slander (buhtan), and she must repent to Allah Almighty, and supplicate and seek forgiveness for that husband. She is not obligated to inform him or seek his pardon. The correct view is that it is sufficient to seek forgiveness for him and to mention his good qualities in the places where she slandered him, because informing him might fill his heart with resentment and harm him. This is the view held by Ibn Taymiyyah and others, in contrast to those who likened it to financial rights.