I heard the Messenger of Allah ﷺ seek refuge during his prayer from the trial of the Dajjal.
سمعت رسول الله ﷺ يستعيذ في صلاته من فتنة الدجال.
Bukhari narrated it in the Book of Fitan (7129), and Muslim in the Book of Mosques and Places of Prayer (587), both through the route of Ibrahim bin Saad, from Salih, from Ibn Shihab, who said, Urwa bin Zubayr informed me that Ayesha said, and then he mentioned it.The hadiths about seeking refuge from Dajjal are numerous and are recorded in the sections on supplications. Dhahabi said, "Seeking refuge from Dajjal is transmitted through mutawatir chains from the Prophet ﷺ," just as Abu Dawud said.