Musnad Ahmad 30:1184

'Abd al-Samad and 'Affan narrated to us, they said: Hammam narrated to us, he said: Qatadah narrated to us, from al-Hasan, from Ziyad ibn Riyāh, from Abu Hurayrah, that the Messenger of Allah (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)." 'Affan said in his narration: And when Qatadah would say "and the general affair," he would say: "The affair of the Hour."