Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 661
Narrated Ibn 'Umar:
When the earliest emigrants came to Al-'Usba a place in Quba', before the arrival of the Prophet- Salim, the slave of Abu Hudhaifa, who knew the Qur'an more than the others used to lead them in prayer.
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