An-Nawawi Hadith - 40

أَخَذَ رَسُولُ اللهِ صلی الله عليه و سلم بِمَنْكِبِي فَقَالَ: كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ عَابِرُ سَبِيلٍ. وَكَانَ ابْنُ عُمَرَ رَضِيَ اللهُ عَنْهُمَا يَقُولُ: إِذَا أَمْسَيْتَ فَلاَ تَنْتَظِرِ الصَّبَاحَ، وَإِذَا أَصْبَحْتَ فَلاَ تَنْتَظِرِ الْمَسَاءَ، وَخُذْ مِنْ صِحَّتِكَ لِمَرَضِكَ وَمِنْ حَيَاتِكَ لِمَوْتِكَ رَوَاهُ الْبُخَارِيُّ

On the authority of Ibn 'Umar, radiyallahu 'anhu, who said: The Messenger of Allah, sallallahu 'alayhi wasallam, took me by the shoulder and said: "Be in this world as though you were a stranger or a traveler/wayfarer." Ibn 'Umar used to say: "When evening comes, do not expect (to live till) morning, and when morning comes, do not expect (to live till) evening. Take from your health (a preparation) for your illness, and from your life for your death." [Al-Bukhari]