The Messenger of Allah (ﷺ) said: I was commanded to prostrate myself on the seven (bones) and forbidden to fold back hair and clothing. (The seven bones are): forehead, nose, hands, knees and feet.
Reference: Sahih Muslim 490 e In-book : Book 4, Hadith 261 USC-MSA web (English) : Book 4, Hadith 995 (deprecated)
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