In a ruling that underlines the tension between Muslim customs and European laws, the judge, Christa Datz-Winter, noted that the couple came from a Moroccan cultural milieu, in which it is common for husbands to beat their wives. The Koran, she wrote in her decision, sanctions such physical abuse.

News of the ruling brought swift and sharp condemnation from politicians, legal experts and Muslim leaders in Germany, many of whom said they were confounded that a German judge would put seventh-century Islamic religious teaching ahead of German law in deciding a case of domestic violence. ...