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When Umar was stabbed by a Persian slave Firoz, a question arose whether this was the act of a single disgruntled person or whether it was the result of a conspiracy. Abdur Rahman b Abu Bakr reported that the previous day, he had seen Firoz, Jafina and 1-lurmuzan conferring together. Seeing him the three men were confused, and a double edged dagger fell from the hands of one of them. It was alleged that that was the dagger with which Umar had been stabbed.
"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