Abdullah b Salam
Abdullah b Salam said that those who had shed the blood of Uthman were guilty of revolt against God. He said that when a Prophet is killed unjustly, 70,000 persons are killed in sequel, and when a Caliph is killed unjustly, 35,000 persons are apt to suffer death in sequel. He added that after Uthman there would be great bloodshed among the Muslims, and the toll of death may be as heavy as 35,000.
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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