Musnad Abu Ya'la al-Mawsili 6:28

Zuhayr narrated to us, Yahya ibn Abi Bukayr narrated to us, Shu'bah narrated to us, from 'Abd al-Malik ibn 'Umayr, from Mus'ab ibn Sa'd, who said: Sa'd used to teach us five things which he would mention from the Prophet, may Allah bless him and grant him peace: "O Allah, I seek refuge in You from miserliness, and I seek refuge in You from cowardice, and I seek refuge in You from being returned to the vilest of age, and I seek refuge in You from the trial of the world, and I seek refuge in You from the punishment of the grave." Shu'bah said: I asked Ibn 'Umayr about the trial of the world, and he said: "The Dajjal."