Urf In Islam
The injunctions of shariah which belongs to social and political norms consider Urf to determine the ruling. for example, the amount of Diyat (bloodmoney, Dowry (Haq e mehr), the definition and application of Fohash (obscenity) and forms of mutual consultations (umrohum Shura Bynahum) etc, are subject to Urf. But the injunctions which belong to worship rituals or the human values which do no change with the change in the society like prayer, fast, and marriage and divorce do not accept Urf in their ruling.