Yahya related to me from Malik from Abu'zZubayr al-Makki fromTawus al-Yamani from Abdullah ibn Abbas that the Messenger of Allah,may Allah bless him and grant him peace, used to teach this dua in thesame way that he would teach them a sura of the Qur'an, "O Allah, Iseek refuge in You from the torment of Jahannam, and I seek refuge inYou from the trial of the Dajjal, and I seek refuge in You from thetrial of life and death."Allahumma inniy audhu bika minadhabi jahannama, wa audhu bika min adhabi'l-qabri, wa audhu bika minfitnati'l-mahya wa mamati.
USC-MSA web (English) reference: Book 15, Hadith 33
Arabic reference: Book 15, Hadith 505