Musnad Ahmad 1153:2076

Uthman ibn Umar narrated to us, he said: Yunus informed us, from al-Zuhri, from Urwah, from Aisha, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "If I had faced of my affair what I have turned my back upon, I would not have driven the sacrificial animal, and I would have exited the state of ihram along with those who exited the state of ihram from the Umrah."