Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2685
'Uthman b. 'Urwa reported on the authority of his father that he said: I asked 'A'isha with what thing she perfumed the Messenger of Allah (may peace be upon him) at the time of entering upon the state of Ihram. She said: With the best of perfume.