The Book of Prayers (Kitab Al-Salat) 
Muslim :: Book 4 : Hadith 993
Ibn 'Abbas reported: The Messenger of Allah (may peace be upon him) had been commanded to prostrate on seven (bones) and forbidden to fold back hair and clothing.
The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 993
Ibn 'Abbas reported: The Messenger of Allah (may peace be upon him) had been commanded to prostrate on seven (bones) and forbidden to fold back hair and clothing.