كتاب الفضائل
43
The Book of Virtues
(19)
Chapter: His Closeness To The People, Their Seeking Blessing From Him And His Humility Towards Them
(19)
باب قُرْبِ النَّبِيِّ عَلَيْهِ السَّلاَمُ مِنَ النَّاسِ وَتَبَرُّكِهِمْ بِهِ ‏.‏

Anas reported:

I saw when the Messenger of Allah (ﷺ) got his hair cut by the barber, his Companions came round him and they eagerly wanted that no hair should fall but in the hand of a person.
حَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا أَبُو النَّضْرِ، حَدَّثَنَا سُلَيْمَانُ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، قَالَ لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم وَالْحَلاَّقُ يَحْلِقُهُ وَأَطَافَ بِهِ أَصْحَابُهُ فَمَا يُرِيدُونَ أَنْ تَقَعَ شَعْرَةٌ إِلاَّ فِي يَدِ رَجُلٍ ‏.‏
Reference : Sahih Muslim 2325
In-book reference : Book 43, Hadith 101
USC-MSA web (English) reference : Book 30, Hadith 5750
  (deprecated numbering scheme)