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.
لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ ﷺ وَالْحَلاَّقُ يَحْلِقُهُ وَأَطَافَ بِهِ أَصْحَابُهُ فَمَا يُرِيدُونَ أَنْ تَقَعَ شَعْرَةٌ إِلاَّ فِي يَدِ رَجُلٍ