Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 683
Narrated Abu Huraira:
The Prophet prayed two Rakat of Zuhr prayer (instead of four) and he was told that he had prayed two Rakat only. Then he prayed two more Rakat and finished them with the Taslim followed by two prostrations.
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