Characteristics of Prayer
Bukhari :: Book 1 :: Volume 12 :: Hadith 775
Narrated Al-Bara' bin 'Azib:
(and he was not a liar) We used to pray behind the Prophet and when he said, "Sami' a-l-lahu Liman hamida", none of us would bend his back (to go for prostration) till the Prophet had placed his, forehead on the ground.
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