Sahih al-Bukhari, Volume 8, Book 76, Hadith 427 (USC-MSA) ⓘ
Narrated Anas bin Malik: The Prophet drew a few lines and said, "This is (man's) hope, and this is the instant of his death, and while he is in this state (of hope), the nearer line (death) comes to Him."
حَدَّثَنَا مُسْلِمٌ، حَدَّثَنَا هَمَّامٌ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، عَنْ أَنَسٍ، قَالَ خَطَّ النَّبِيُّ صلى الله عليه وسلم خُطُوطًا فَقَالَ " هَذَا الأَمَلُ وَهَذَا أَجَلُهُ، فَبَيْنَمَا هُوَ كَذَلِكَ إِذْ جَاءَهُ الْخَطُّ الأَقْرَبُ " .
also referenced under: Book 81, Hadith 7 (In-Book) & Hadith 6418 (DarusSalam)