Abdullah ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, took hold of my shoulder and said:
كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ، أَوْ عَابِرُ سَبِيلٍ
Be in this world as if you were a stranger or a traveler along a path.
Ibn Umar, may Allah be pleased with him, would say:
إِذَا أَمْسَيْتَ فَلاَ تَنْتَظِرِ الصَّبَاحَ وَإِذَا أَصْبَحْتَ فَلاَ تَنْتَظِرِ الْمَسَاءَ وَخُذْ مِنْ صِحَّتِكَ لِمَرَضِكَ وَمِنْ حَيَاتِكَ لِمَوْتِكَ
If you make it to the evening, do not wait for the morning. If you make it to the morning, do not wait for the evening. Take from your health for your sickness, and from your life for your death.
Ṣaḥīḥ al-Bukhārī 6416, Grade: Sahih