Musnad Ahmad 30:3509

Abu Dawud narrated to us, Imran narrated to us, from Qatadah, from Abdullah ibn Rabah, from Abu Hurairah, that the Prophet, peace and blessings of Allah be upon him, said: "Hasten to perform deeds before six things: the rising of the sun from its place of setting, the Dajjal, the smoke, the beast of the earth, the private affair of one of you (death), and the general affair (the Hour)."