(Imām Bukhārī narrates): Mu'allā ibn Asad narrated to us, he said: Wuhaib narrated to us, from 'Abdullāh ibn Tāwūs, from his father, from Ibn 'Abbās, may Allāh be pleased with them both, he narrates that the Messenger of Allāh ﷺ said:
I have been commanded that I should perform sajdah upon seven bones: upon the forehead — and he pointed with his hand towards the nose — and upon the two hands, and upon the two knees, and upon the tips of the feet, and we should not fold up the garments or the hair.
حَدَّثَنَا مُعَلَّى بْنُ أَسَدٍ، قَالَ حَدَّثَنَا وُهَيْبٌ، عَنْ عَبْدِ اللَّهِ بْنِ طَاوُسٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عَبَّاسٍ، رضى الله عنهما قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ عَلَى الْجَبْهَةِ ـ وَأَشَارَ بِيَدِهِ عَلَى أَنْفِهِ ـ وَالْيَدَيْنِ، وَالرُّكْبَتَيْنِ وَأَطْرَافِ الْقَدَمَيْنِ، وَلاَ نَكْفِتَ الثِّيَابَ وَالشَّعَرَ ".
Reference: Sahih Al Bukhari 812