Musnad Ahmad 1153:970

'Affan narrated to us, he said: Wuhayb narrated to us, he said: Hisham ibn 'Urwah narrated to us, from 'Uthman ibn 'Urwah, from his father, from 'Aishah, she said: "I used to perfume the Messenger of Allah, peace and blessings of Allah be upon him, at the time of his Ihram with the best perfume I could find."