The Prophet ﷺ said, "I have been ordered to prostrate on seven bones i.e. on the forehead along with the tip of the nose and the Prophet ﷺ pointed towards his nose, both hands, both knees and the toes of both feet and not to gather the clothes or the hair."  

قَالَ النَّبِيُّ ﷺ أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ عَلَى الْجَبْهَةِ وَأَشَارَ بِيَدِهِ عَلَى أَنْفِهِ وَالْيَدَيْنِ وَالرُّكْبَتَيْنِ وَأَطْرَافِ الْقَدَمَيْنِ وَلاَ نَكْفِتَ الثِّيَابَ وَالشَّعَرَ