Sahih al-Bukhari 116
Sahih al-Bukhari · Book 3: Knowledge · To speak about (religious) knowledge at night
Narrated `Abdullah bin `Umar:
حَدَّثَنَا سَعِيدُ بْنُ عُفَيْرٍ ، قَالَ حَدَّثَنِي اللَّيْثُ ، قَالَ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ خَالِدٍ ، عَنِ ابْنِ شِهَابٍ ، عَنْ سَالِمٍ ، وَأَبِي، بَكْرِ بْنِ سُلَيْمَانَ بْنِ أَبِي حَثْمَةَ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، قَالَ صَلَّى بِنَا النَّبِيُّ صلى الله عليه وسلم الْعِشَاءَ فِي آخِرِ حَيَاتِهِ، فَلَمَّا سَلَّمَ قَامَ فَقَالَ " أَرَأَيْتَكُمْ لَيْلَتَكُمْ هَذِهِ، فَإِنَّ رَأْسَ مِائَةِ سَنَةٍ مِنْهَا لاَ يَبْقَى مِمَّنْ هُوَ عَلَى ظَهْرِ الأَرْضِ أَحَدٌ " .
Once the Prophet (ﷺ) led us in the `Isha' prayer during the last days of his life and after finishing it (the prayer) (with Taslim) he said: "Do you realize (the importance of) this night?" Nobody present on the surface of the earth tonight will be living after the completion of one hundred years from this night."