Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2695
'A'isha (Allah be pleased with her) reported: I still seem to see the glisten- ing of musk (in the parting of the head) of the Messenger of Allah (may peace be upon him) while he was in the state of Ihram.