Musannaf Ibn Abi Shayba 37:355

Waki' and 'Abdullah ibn Numayr narrated to us, from Hisham, from his father, from 'Aishah, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to say: "O Allah, I seek refuge in You from the evil of the tribulation of the False Messiah (Al-Masih ad-Dajjal)."