Abu Hurairah RA reported: Messenger of Allah (sallallaahu ’alayhi wa sallam) said, “Hasten to do good deeds before you are overtaken by one of the seven afflictions.” Then (giving a warning) he said, “Are you waiting for such poverty which will make you unmindful of devotion; or prosperity which will make you corrupt, or disease as will disable you, or such senility as will make you mentally unstable, or sudden death, or Ad-Dajjal who is the worst expected absent, or the Hour, and the Hour will be most grievous and most bitter.”
(Tirmidhi)
