Al-Kāfi - Volume 3 > Causes of Death and that Believing People May Die by any Manner of Dying
Hadith #5

5ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ وَالْحَسَنِ بْنِ مَحْبُوبٍ عَنْ أَبِي جَمِيلَةَ عَنْ جَابِرٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ قَالَ رَسُولُ الله (صلّى اللهُ عَلَيْهِ وَآلِه) إِنَّ مَوْتَ الْفَجْأَةِ تَخْفِيفٌ عَنِ الْمُؤْمِنِ وَأَخْذَةُ أَسَفٍ عَنِ الْكَافِرِ.

5. A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad ibn abu Nasr and al-Hassan ibn Mahbub from abu Jamilah from Jabir who has said the following: “Abu Ja’far, ‘Alayhi al-Salam, has said, ‘The Messenger of Allah has said, ‘A sudden death compensates (for the short comings) of a believing person but it is a regrettable grip for an unbeliever.’”