Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 606
Narrated 'Aun bin Abi Juhaifa:
My father said, "I saw Allah's Apostle at a place called Al-Abtah. Bilal came and informed him about the prayer and then came out with an Anza and planted it in front of Allah's Apostle at Al-Abtah and pronounced the Iqama."
Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star