"The Prophet ﷺ was commanded to prostrate on seven-and he was forbidden to tuck up his hair and garment-on his hands, his knees, the edges of his feet." Sufyan said: "Ibn Tawus said to us: 'He put his hand on his forehead and moved it down to his nose and said: This one thing.'" (Using translation from Nasāʾī 1098)  

عَنِ ابْنِ عَبَّاسٍ أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ عَلَى سَبْعٍ وَنُهِيَ أَنْ يَكْفِتَ الشَّعْرَ وَالثِّيَابَ عَلَى يَدَيْهِ وَرُكْبَتَيْهِ وَأَطْرَافِ أَصَابِعِهِ قَالَ سُفْيَانُ قَالَ لَنَا ابْنُ طَاوُسٍ وَوَضَعَ يَدَهُ عَلَى جَبْهَتِهِ وَأَمَرَّهَا عَلَى أَنْفِهِ قَالَ هَذَا وَاحِدٌ وَاللَّفْظُ لِمُحَمَّدٍ  

[Machine] The Prophet ﷺ was commanded to prostrate from seven parts of his body: his hands, knees, fingertips, forehead. He was forbidden to wipe his hair and clothes. Sufyan said, and Ibn Tawus added, that he placed his hand on his forehead, then commanded it to be placed on his nose until it reached the tip of his nose. My father used to count this as one.  

أُمِرَ النَّبِيُّ ﷺ أَنْ يَسْجُدَ مِنْهُ عَلَى سَبْعَةٍ يَدَيْهِ وَرُكْبَتَيْهِ وَأَطْرَافِ أَصَابِعِهِ وَجَبْهَتِهِ وَنُهِيَ أَنْ يَكْفِتَ مِنْهُ الشَّعْرَ وَالثِّيَابَ قَالَ سُفْيَانُ وَزَادَ ابْنُ طَاوُسٍ فَوَضَعَ يَدَهُ عَلَى جَبْهَتِهِ ثُمَّ أَمَرَّ بِهَا عَلَى أَنْفِهِ حَتَّى بَلَغَ بِهَا طَرَفَ أَنْفِهِ قَالَ وَكَانَ أَبِي يَعُدُّ هَذَا وَاحِدًا