An Nawawi Hadith Number 40 : The Authority Of Abdullah bin Omar

The messenger of Allah took me by the shoulder and said : “Be in the world as though you were a stranger or a wayfarer.” The son of Omar used to say: “At evening do not expect [to live till] morning, and at morning do not expect [to live till] evening. Take from your health for your illness and from your life for your death.”

Reporters.
Related by Bukhari.