Shama-il Tirmidhi
Shama-il Tirmidhi Chapter 004, Hadith Number 005 (035).
Hadith Section/Book: Shama-il Tirmidhi Chapter 04. The Combing Of The Hair Of Rasoolullah
Hazrat Humayd bin Abdurrahman (Radiallahu anhu) relates form a Sahabi that Sayyidina Rasulullah (Sallallahu alaihe wasallam) combed his hair occasionally.