Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 28
Narated By A Man from the Companions : Humayd al-Himyari said: I met a man (Companion of the Prophet) who remained in the company of the Prophet (pbuh) just as AbuHurayrah remained in his company. He then added: The Apostle of Allah (pbuh) forbade that anyone amongst us should comb (his hair) every day or urinate in the place where he takes a bath.