Anas bin Malik reported,

I saw the Messenger of Allah ﷺ while the barber was shaving his head, and his Companions had gathered around him. They were determined that not a single hair should fall except into the hand of one of them.

حدثنا محمد بن رافع حدثنا أبو النضر حدثنا سليمان عن ثابت

عن أنس قال

لقد رأيت رسول الله ﷺ والحلاق يحلقه وأطاف به أصحابه فما يريدون أن تقع شعرة إلا في يد رجل