Musnad Ahmad 1153:655

Muhammad ibn Ubayd narrated to us, he said: Ubaydullah narrated to us, from al-Qasim ibn Muhammad, from Aisha, she said: "I perfumed the Messenger of Allah, peace and blessings of Allah be upon him, for his ihram when he entered into ihram, and for his exiting it when he exited it at Mina, before he performed the tawaf of ifadah."