Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2686
'A'isha (Allah be pleased with her) reported: I applied the best perfume, which I could get, to the Messenger of Allah (may peace be upon him) before entering upon the state of Ihram (and after this) he put on the Ihram.