Musnad Ahmad 1153:1509

Rawh narrated to us, Hisham bin Abi Abdullah narrated to us, from Hammad, from Ibrahim, from al-Aswad, from Aisha, that she said: "It is as if I am looking at the glistening of the perfume in the parting of the hair of the Messenger of Allah, may Allah bless him and grant him peace, while he was in the state of Ihram."