He was not afraid of death
In the Battle of Siffin, Ali penetrated into the front ranks of the Syrian forces without any protective armor. One after another his assailants fell before the onslaught of his sword. His son Imam Hasan objected to such neglect to protect himself. Ali said, "It is immaterial to me whether I fall to death or death fall on me. I love death as much as a suckling loves the milk of his mother."
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"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari