Al-Kāfi - Volume 3 > Causes of Death and that Believing People May Die by any Manner of Dying
Hadith #1

1ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ فَضَّالٍ عَمَّنْ حَدَّثَهُ عَنْ سَعْدِ بْنِ طَرِيفٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ كَانَ النَّاسُ يَعْتَبِطُونَ اعْتِبَاطاً فَلَمَّا كَانَ زَمَانُ إِبْرَاهِيمَ (عَلَيْهِ الْسَّلام) قَالَ يَا رَبِّ اجْعَلْ لِلْمَوْتِ عِلَّةً يُؤْجَرُ بِهَا الْمَيِّتُ وَيُسَلَّى بِهَا عَنِ الْمُصَابِ قَالَ فَأَنْزَلَ الله عَزَّ وَجَلَّ الْمُومَ وَهُوَ الْبِرْسَامُ ثُمَّ أَنْزَلَ بَعْدَهُ الدَّاءَ.

1. Ali ibn Ibrahim has narrated from his father from ibn Faddal from those who narrated to him from Sa‘d ibn Tarif who has said the following: “Abu Ja’far, ‘Alayhi al-Salam, has said, ‘People would just drop dead. Ibrahim (Abraham), ‘Alayhi al Salam, in his time pleaded before Allah to create a cause for death so the dying person receives rewards and the grieving people find solace. Allah, the Majestic, the Glorious, then sent al-Mum, which is a kind of fever causing hallucination and thereafter He sent medicine.’”