Musnad Ahmad 1153:2359

'Amir ibn Salih ibn 'Abdullah ibn 'Urwah ibn al-Zubayr ibn al-'Awwam, Abu al-Harith, narrated to us, saying: Hisham ibn 'Urwah narrated to me, from his father, from 'Aishah, "That the Messenger of Allah, peace and blessings of Allah be upon him, used to pray the 'Asr prayer while the sun had not yet departed from her chamber." And the wall was a cubit's length, and 'Amir gestured with his hand.