What is the ruling on taking contraceptives without the husband's knowledge, or requesting a divorce from him, due to his repeated abuse with insults and severe beatings? And is it permissible for the wife to seek a divorce due to harm?

Childbearing is a shared right of both spouses, so it is not permissible for the wife to refuse childbearing without her husband's permission. If the husband is oppressive or abusive, the wife has the right to refer her case to the judge. It is advisable to reach an understanding with the husband, treat him with kindness, and seek help from righteous people. If this does not work, she should weigh the harm of divorce against the harm of staying with him, and choose the lesser of the two harms.