The Apostle of Allah ﷺ had been commanded that he should prostrate on the seven (bones) and he was forbidden to fold back the hair and clothing. And in the narration transmitted by Abu Rabi' (the words are):" on the seven bones and I was forbidden to fold back the hair and clothing". According to Abu'l-Rabi' (the seven bones are): The hands, the knees, and the (extremities) of the feet and the forehead.  

أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ عَلَى سَبْعَةٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرَهُ وَثِيَابَهُ هَذَا حَدِيثُ يَحْيَى وَقَالَ أَبُو الرَّبِيعِ عَلَى سَبْعَةِ أَعْظُمٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرَهُ وَثِيَابَهُ الْكَفَّيْنِ وَالرُّكْبَتَيْنِ وَالْقَدَمَيْنِ وَالْجَبْهَةِ  

I was commanded to prostrate myself on seven bones and not to fold back clothing or hair.  

عَنِ النَّبِيِّ ﷺ قَالَ أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ وَلاَ أَكُفَّ ثَوْبًا وَلاَ شَعْرًا  

The Messenger of Allah ﷺ had been commanded to prostrate on seven (bones) and forbidden to fold back hair and clothing.  

عَنِ ابْنِ عَبَّاسٍ أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ عَلَى سَبْعٍ وَنُهِيَ أَنْ يَكْفِتَ الشَّعْرَ وَالثِّيَابَ  

I have been commanded to prostrate myself on seven bones:" forehead," and then pointed with his hand towards his nose, hands, feet, and the extremities of the feet; and we were forbidden to fold back clothing and hair.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ الْجَبْهَةِ وَأَشَارَ بِيَدِهِ عَلَى أَنْفِهِ وَالْيَدَيْنِ وَالرِّجْلَيْنِ وَأَطْرَافِ الْقَدَمَيْنِ وَلاَ نَكْفِتَ الثِّيَابَ وَلاَ الشَّعْرَ  

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.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعٍ وَلاَ أَكْفِتَ الشَّعْرَ وَلاَ الثِّيَابَ الْجَبْهَةِ وَالأَنْفِ وَالْيَدَيْنِ وَالرُّكْبَتَيْنِ وَالْقَدَمَيْنِ  

"When a person prostates, he prostates on seven part of the body: His face, his hands, his knees and his feet."  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا سَجَدَ الْعَبْدُ سَجَدَ مَعَهُ سَبْعَةُ أَطْرَافٍ وَجْهُهُ وَكَفَّاهُ وَرُكْبَتَاهُ وَقَدَمَاهُ  

Why is it that you touched my head? He (Ibn 'Abbas) replied: (The man who observes prayer with plaited hair) is like one who prays with his hands tied behind.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّمَا مَثَلُ هَذَا مَثَلُ الَّذِي يُصَلِّي وَهُوَ مَكْتُوفٌ