What did the Prophet Muhammad (saw) do when he said "Sami`a l-lahu liman hamidah"?
 Narrated Al-Bara' bin `Azib:                     (He was not a liar) We used to pray behind the Prophet and when he said, "Sami`a l-lahu liman hamidah", none of us would bend his back (to go for prostration) till the Prophet had placed his, forehead on the ground.