Sahih Muslim Book 7, Hadith Number 2694.

Chapter : Applying of perfume to the body before entering upon the state of Ihram.

‘Aisha (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 glistening of oil on his head and beard.