The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 856
Anas reported: The Apostle of Allah (may peace be upon him) said: Complete the bowing and prostration well. By Allah, 1 see you behind my back as to how you bow and prostrate or when you bow and prostrate.
Source materials are from the University of Southern California MSA site|
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