Hadith: Be in this world as if you are a stranger or a wayfarer

عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: أَخَذَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ بِمَنْكِبِي، فَقَالَ:
«كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ عَابِرُ سَبِيلٍ»، وَكَانَ ابْنُ عُمَرَ، يَقُولُ: إِذَا أَمْسَيْتَ فَلاَ تَنْتَظِرِ الصَّبَاحَ، وَإِذَا أَصْبَحْتَ فَلاَ تَنْتَظِرِ المَسَاءَ، وَخُذْ مِنْ صِحَّتِكَ لِمَرَضِكَ، وَمِنْ حَيَاتِكَ لِمَوْتِكَ.
[صحيح] - [رواه البخاري] - [صحيح البخاري: 6416]

‘Abdullah ibn ‘Umar (may Allah be pleased with him and his father) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) took me by the shoulder and said:
"Be in this world as if you are a stranger or a wayfarer." Ibn ‘Umar used to say: If you reach the evening, do not wait for the morning, and if you reach the morning, do not wait for the evening. Take from your health for your sickness and from your life for your death.
[Authentic hadith] - [Narrated by Bukhari] - [Sahih Bukhari - 6416]

Explanation

Ibn ‘Umar (may Allah be pleased with him and his father) mentioned that the Prophet (may Allah's peace and blessings be upon him) took him by the shoulder—the part that joins the arm with the shoulder—and said to him, Be in this world as if you are a stranger who arrived at a country where he has no house to shelter him and no one to keep his accompany. He is away from family, children, and relationships that are the cause behind one's distraction from the Creator. Rather, be more than a stranger, i.e., a wayfarer who passes by the way seeking his homeland. This is because the stranger may live in a foreign land and reside therein, unlike the wayfarer who passes by swiftly without stopping and whose main concern is to reach his homeland. Just as a traveler needs nothing beyond what helps him reach his destination, a believer needs nothing in this world beyond what helps him reach his destination in the Hereafter.
Ibn ‘Umar acted upon this advice, and he used to say: If you reach the morning, do not wait for the evening; and if you reach the evening, do not wait for the morning, and count yourself among the grave dwellers. Given the fact that health and sickness are inevitable in one's life, then hasten to obedience when you are in good health before getting sick, and take advantage of your health in performing righteous acts before being prevented by sickness. Take advantage of your life in this world and do everything that could benefit you after your death.