prayer was soon to begin, and the second adhan would be the regular one held in the mosque. Not all Sunnis prefer two adhans as the need for warning the people of the impending time for prayer is no longer essential now that the times for prayers are well known. Shia Shia sources state Muhammad, according to God's command, ordered the adhan as a means of calling Muslims to prayer. Shia Islam teaches that no one else contributed, or had any authority to contribute, towards the composition of the adhan. Shia sources also narrate that Bilal ibn Rabah al-Habashi was, in fact, the first person to recite the Adhan publicly out loud in front of the Muslim congregation. The fundamental phrase lā ʾilāha ʾillā llāh is the foundation stone of Islam along with the belief in it. It declares that "there is no god but the God". This is the confession of Tawhid or the "doctrine of Oneness [of God]". The phrase Muḥammadun rasūlu -llāh fulfills the requirement that there should be someone to guide in the name of God, which states Muhammad is God's Messenger. This is the acceptance of prophethood or Nabuwat of Muhammad. Muhammad declared Ali ibn Abi Talib as his successor, at Ghadir Khumm, which was required for the continuation of his guidance. According to the hadith of the pond of Khumm, Muhammad stated that "Of whomsoever I am the authority, Ali is his authority". Hence, it is recommended to recite the phrase ʿalīyun walī -llāh ("Ali is His [God's] Authority"). In one of the Qiblah of Ma'ad al-Mustansir Billah (1035–1094) of Fatemi era masjid of Qahira (Mosque of Ibn Tulun) engraved his name and kalimat ash-shahādah as lā ʾilāha ʾillā -llāh, muḥammadun rasūlu -llāh, ʿalīyun walīyu -llāh (). Adhan reminds Muslims of these three Islamic teaching Tawhid, Nabuwat and Imamate before each prayer. These three emphasise devotion to God, Muhammad and Imam, which are considered to be so linked together that they can not be viewed separately; one leads to other and finally to God. The phrase is optional to some Shia as justified above. They feel that Ali's Walayah ("Divine Authority") is self-evident, a testification and need not be declared. However, the greatness of God is also taken to be self-evident, but Muslims still declare Allāhu ʾakbar to publicize their faith. This is the reason that the most Shia give for the recitation of