In the lifetime of the Prophet, Abu Bakr and `Umar, the Adhan for the Jumua prayer used to bepronounced when the Imam sat on the pulpit. But during the Caliphate of `Uthman when the Muslimsincreased in number, a third Adhan at Az-Zaura' was added. Abu `Abdullah said, "Az-Zaura' is a placein the market of Medina."