Musnad Ahmad 1153:551

Abu al-Mughirah narrated to us, he said: al-Awza'i narrated to us, he said: al-Zuhri narrated to us, from 'Urwah, from 'Aishah, she said: "The Messenger of Allah, peace and blessings of Allah be upon him, would come to me while he was in I'tikaf in the mosque, until he would lean against the door of my chamber, and I would wash his head while I was in my chamber, and the rest of his body was in the mosque."