ENOfficial
It was narrated that Ibn ‘Umar said: “The Messenger of Allah (ﷺ) took hold of some part of my body and said: ‘O ‘Abdullah, be in this world like a stranger, or one who is passing through, and consider yourself as one of the people of the graves.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ لَيْثٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عُمَرَ، قَالَ أَخَذَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ بِبَعْضِ جَسَدِي فَقَالَ " يَا عَبْدَ اللَّهِ كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ كَأَنَّكَ عَابِرُ سَبِيلٍ وَعُدَّ نَفْسَكَ مِنْ أَهْلِ الْقُبُورِ " .
sunnah.com