Musnad Ahmad 1153:2181

'Amir ibn Salih, from the descendants of 'Abdullah ibn al-Zubayr, narrated to us, saying: Hisham ibn 'Urwah narrated to me, from his father, from 'Aishah, that al-Harith ibn Hisham asked the Messenger of Allah, peace and blessings of Allah be upon him: "How does the revelation come to you?" He mentioned something similar to the hadith of Malik.