Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 638
Narrated Abu Sa'id Al-Khudri:
A cloud came and it rained till the roof started leaking and in those days the roof used to be of the branches of date-palms. Iqama was pronounced and I saw Allah's Apostles prostrating in water and mud and even I saw the mark of mud on his forehead.
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