Explanation of the Book of the Adhan-09a

The reciter: In the name of Allah, the Most Gracious, the Most Merciful. All praise is due to Allah, Lord of the worlds, and may Allah send blessings and peace upon His servant and messenger, our Prophet Muhammad, and upon his family and all his Companions. Imam al-Bukhari (may Allah have mercy on him) said in his Sahih, in the Book of Congregation and the Imam, in the chapter on straightening the rows as part of perfecting the prayer:
Abu al-Walid narrated to us, saying: Shu'bah narrated to us from Qatadah from Anas from the Prophet (peace and blessings be upon him), who said: