Musnad Ahmad 1153:2308

Ya'qub narrated to us, he said: My father narrated to us, from Salih, he said: Ibn Shihab informed me, from 'Urwah ibn al-Zubayr, that 'Aishah said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, seeking refuge in his prayer from the trial of the Dajjal.