سنن ابن ماجه #4102
Sahih (Authentic)
Asceticism
كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ عَابِرُ سَبِيلٍ
The Messenger of Allah (ﷺ) said: 'Be in this world as if you were a stranger or a traveler.'
سلسلة الرواة (الإسناد)
Narrated Ibn 'Abbas