"The Messenger of Allah ﷺ grabbed me on part of my body and said: 'Be in the world like a stranger or a passerby, and count yourself among the inhabitants of the grave.'" Ibn 'Umar said to me: "When you wake up in the morning, then do not concern yourself with the evening. And when you reach the evening, then do not concern yourself with the morning. Take from your health before your illness, and from your life before your death, for indeed O slave of Allah! You do not know what your description shall be tomorrow." (sahih)  

أَخَذَ رَسُولُ اللَّهِ ﷺ بِمِنْكَبِي فَقَالَ كُنْ فِي الدُّنْيَا كَأَنَّكَ غَرِيبٌ أَوْ عَابِرُ سَبِيلٍ وَعُدَّ نَفْسَكَ فِي أَهْلِ الْقُبُورِ فَقَالَ لِي ابْنُ عُمَرَ إِذَا أَصْبَحْتَ فَلاَ تُحَدِّثْ نَفْسَكَ بِالْمَسَاءِ وَإِذَا أَمْسَيْتَ فَلاَ تُحَدِّثْ نَفْسَكَ بِالصَّبَاحِ وَخُذْ مِنْ صِحَّتِكَ قَبْلَ سَقَمِكَ وَمِنْ حَيَاتِكَ قَبْلَ مَوْتِكَ فَإِنَّكَ لاَ تَدْرِي يَا عَبْدَ اللَّهِ مَا اسْمُكَ غَدًا  

"This is the son of Adam, and this is his life-span." And he placed his hand at the (height of the) nape of his neck, then he extended it (higher) and said:" From there is what is hoped for, from there is what is hoped for."  

قَالَ رَسُولُ اللَّهِ ﷺ هَذَا ابْنُ آدَمَ وَهَذَا أَجَلُهُ وَوَضَعَ يَدَهُ عِنْدَ قَفَاهُ ثُمَّ بَسَطَهَا فَقَالَ وَثَمَّ أَمَلُهُ وَثَمَّ أَمَلُهُ وَثَمَّ أَمَلُهُ  

"The Messenger of Allah ﷺ passed by us while we were repairing a hut of ours, so he said: 'What is this?' We said:"It has become weak, so we are repairing it.' He said: 'I do not think but that the matter (of life) is more in fleeting than that."  

مَرَّ عَلَيْنَا رَسُولُ اللَّهِ ﷺ وَنَحْنُ نُعَالِجُ خُصًّا لَنَا فَقَالَ مَا هَذَا فَقُلْنَا قَدْ وَهَى فَنَحْنُ نُصْلِحُهُ قَالَ مَا أُرَى الأَمْرَ إِلاَّ أَعْجَلَ مِنْ ذَلِكَ