Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, took hold of my shoulder and he said, “Be in this world as if you were a stranger or a traveler along a path.” Ibn Umar said, “If you enter the evening, then do not wait for the morning. If you enter the morning, then do not wait for the evening. Take from your health for your sickness and from your life for your death.”

Source: Sahih Bukhari 6053

Grade: Sahih (authentic) according to Al-Bukhari

عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ رضى الله عنهما قَالَ أَخَذَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِمَنْكِبِي فَقَالَ كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ عَابِرُ سَبِيلٍ وَكَانَ ابْنُ عُمَرَ يَقُولُ إِذَا أَمْسَيْتَ فَلاَ تَنْتَظِرِ الصَّبَاحَ وَإِذَا أَصْبَحْتَ فَلاَ تَنْتَظِرِ الْمَسَاءَ وَخُذْ مِنْ صِحَّتِكَ لِمَرَضِكَ وَمِنْ حَيَاتِكَ لِمَوْتِكَ

6053 صحيح البخاري كتاب الرقاق باب قول النبي صلى الله عليه وسلم كن في الدنيا كأنك غريب أو عابر سبيل