Characteristics of Prayer
Bukhari :: Book 1 :: Volume 12 :: Hadith 701
Narrated Abu Huraira:
The Prophet said, "The Imam is to be followed. Say the Takbir when he says it; bow if he bows; if he says 'Sami a-l-lahu Liman hamida', say, ' Rabbana wa-laka-l-hamd', prostrate if he prostrates and pray sitting altogether if he prays sitting."
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