Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2694
'A'isha (Allah be pleased with her) reported that when the Messenger of Allah (may peace be upon him) intended to enter upon the state of Ihram he perfumed himself with the best of perfumes which he could find and after that I saw the glisten- ing of oil on his head and beard.