[Machine] The Prophet ﷺ was ordered to prostrate on seven parts, and he was forbidden from covering his hair or his clothes on the two palms, the two knees, the two feet, and the forehead. This is mentioned in the hadith of Abu Rabi'ah and in the hadith of Al-Abbas.
أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرَهُ وَثِيَابَهُ الْكَفَّيْنِ وَالرُّكْبَتَيْنِ وَالْقَدَمَيْنِ وَالْجَبْهَةِ لَفْظُ حَدِيثِ أَبِي الرَّبِيعِ وَفِي حَدِيثِ الْعَبَّاسِ أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ عَلَى سَبْعَةٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرًا وَلَا ثَوْبًا أَوْ قَالَ ثِيَابَهُ