It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that at the end of his prayer the Messenger of Allah (peace and blessings be upon him) used to seek refuge from four things, saying: "O Allah, I seek refuge in You from the punishment of the grave; I seek refuge in You from the punishment of Hell; I seek refuge in You from trials, both the apparent and the hidden; and I seek refuge in You from the trial of the one-eyed Dajjal (the great liar)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12724