Fear of the Hellfire killed him...

Ibn al-Mubaarak said, "Muhammad ibn Mutarrif informed us from a trustworthy person that fear of the Hellfire pervaded the insides of a young man from the Ansaar. Whenever he would remember the Fire, he would cry, to the degree that that (worry and fear) kept him confined in his house. That was mentioned to the Prophet , who then went to him in his house. When the Prophet of Allah entered, the young man embraced him and fell down, dead. The Messenger of Allah then said, 'Prepare your companion (for his funeral), for indeed dread of the Hellfire cut his heart." [al-Fitan by Ibn Katheer pg. 513]

It is related that when Salmaan al-Faarisee heard the Saying of Allah:


He took flight for three days, fleeing from terror, not comprehending. He was brought to the Prophet and said, "O Messenger of Allah, this verse has been revealed:



"Then by the One Who sent you with the truth, it has cut my heart."
Then Allah it revealed:

[al-Fitan by Ibn Katheer pg. 514]

Abu Sulayman wrote:

Ibn al-Mubaarak said, "Muhammad ibn Mutarrif informed us from a trustworthy person that fear of the Hellfire pervaded the insides of a young man from the Ansaar. Whenever he would remember the Fire, he would cry, to the degree that that (worry and fear) kept him confined in his house. That was mentioned to the Prophet , who then went to him in his house. When the Prophet of Allah entered, the young man embraced him and fell down, dead. The Messenger of Allah then said, 'Prepare your companion (for his funeral), for indeed dread of the Hellfire cut his heart." [al-Fitan by Ibn Katheer pg. 513]

Wow, subhana'Allah! ina lilahi wa ina ilhi raji3oon.