Musnad Abu Ya'la al-Mawsili 150:24

Narrated to us Ishaq, narrated to us Ma'n al-Qazzaz, from Fulan ibn Muhammad ibn Khalid, from Hisham ibn 'Urwah, from his father, from 'Aishah: That the Prophet, peace and blessings of Allah be upon him, would not interpret anything of the Quran by his own opinion, except for verses, the number of which Jibril had taught him.