In Islam, Friday is like the day of Sabbath. On this day instead of the usual midday service [Zuhr], a two rak‘at namaz is performed in the central mosque of the town or neighbourhood. Local congregations are not held on this occasion and all worshippers are expected to attend the central mosque. Prior to the namaz an imam delivers a sermon. As there is no form of clergy or priesthood in Islam anyone can be chosen to deliver the sermon and lead the prayer service.