The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 959
Al-Bara' reported, and he was no liar: When the Messenger of Allah (may peace be upon him) said: Allah listened to him who praised Him, none of us bent his back till he (the Holy Prophet) prostrated; we then, afterwards, went down in prostration.
Source materials are from the University of Southern California MSA site|
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