Prayer (Kitab Al-Salat): Details of Commencing Prayer
Dawud :: Book 3 : Hadith 895
Narrated Al-Bara' ibn Azib:
Al-Bara' described to us (the nature of prostration). He placed his hands (palms), reclined on his knees, and raised his hips; he said: This is how the Apostle of Allah (peace_be_upon_him) used to prostrate himself.