Musnad Ahmad 1153:2377

Hassan narrated to us, Hammad bin Zaid narrated to us, he said: Mansur narrated to us, from Ibrahim, from al-Aswad, from Aisha, 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, peace and blessings of Allah be upon him, while he was in the state of Ihram."