حَدَّثَنَا عَبْد اللَّهِ وَبِهَذَا الْإِسْنَادِ كَذَا قَالَ أَبِي إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ الْجَبْهَةِ ثُمَّ أَشَارَ بِيَدِهِ إِلَى أَنْفِهِ وَالْيَدَيْنِ وَالرُّكْبَتَيْنِ وَأَطْرَافِ الْقَدَمَيْنِ وَلَا نَكُفَّ الثِّيَابَ وَلَا الشَّعَرَ
مسند امام احمد بن حنبل · Hadith 2658
It was narrated with the same isnad - as my father said - that the Messenger of Allah (PBUH) said: " I have been commanded to prostrate on seven bones: the forehead - then he pointed to his nose - the hands, the knees and the toes, and not to tuck up my garment or hair."
Sanad
حَدَّثَنَا عَبْد اللَّهِ وَبِهَذَا الْإِسْنَادِ كَذَا قَالَ أَبِي