Abu Hurairah, may Allah be pleased with him, narrated that the Messenger of Allah (s.a.w) said:
Race to do works against seven. Are you waiting but for overwhelming poverty, or distracting richness, or debilitating illness, or babbling senility, or sudden death, or the Dajjal, so that hidden evil is what is awaited, or the Hour? The Hour is more calamitous and more bitter. (Daif)