Sahih Bukhari Volume 2, Book 26, Hadith Number 611.

Narated By Said bin Jubair : Ibn ‘Umar used to oil his hair. I told that to Ibrahim who said, “What do you think about this statement: Narrated Aswad from ‘Aisha: As if I were now observing the glitter of the scent in the parting of the hair of the Prophet while he was Muhrim?”