SHORTNESS OF LIFE H 580 "The Prophet, praise and peace be upon him, drew some lines, and then pointing to a line said, 'This line is the human, and this is his life span, while he is as such the nearest line overtakes him." R 580 Bukhari with a chain up to Anas who related this hadith.
575- وعن أنس رضي الله عنه ، قَالَ : خَطَّ النَّبيُّ صلى الله عليه وآله وسلم خُطُوطاً ، فَقَالَ : "هَذَا الإنْسَانُ ، وَهَذَا أجَلُهُ ، فَبَيْنَمَا هُوَ كَذَلِكَ إذْ جَاءَ الخَطُّ الأَقْرَبُ" رواه البخاري .