Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 614
Narrated Jabir bin 'Abdullah:
On the day of Al-Khandaq (the trench), 'Umar bin Al-Khattab went to the Prophet and said, "O Allah's Apostle! By Allah, I could not pray (the 'Asr) till the sun had set." 'Umar told this to the Prophet at the time when a fasting person had done Iftar (taken his meals). The Prophet then went to Buthan and I was with him. He performed ablution and offered the 'Asr prayer after the sun had set and then the Maghrib prayer.
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