The hadith of ibn Abbas radi Allahu anhu reported in the mustadrak of Al-Haakim, musnad Imam Ahmad, and others, with an authentic chain of narration. In this hadith the Prophet sal Allaahu alayhi wa sallam said to a man while he was advising him:
“Take advantage of five matters before five other matters: your youth, before you become old; and your health, before you fall sick; and your richness, before you become poor; and your free time before you become busy; and your life, before your death.”
(via confessionsofahijabi)