It is related that during the course of the siege, Mugheera b Shu'ba went to Uthman, and placed three courses of action before him, firstly to go forth and fight against the refuels; secondly to mount a camel and go to Makkah; and thirdly to betake himself to Syria. Uthman rejected all the three proposals He rejected the first proposal saying that he did not want to be the first Caliph during whose time blood in shed. He turned down the second proposal to escape to Makkah on the ground that he had heard from the Holy Prophet that a man of the Quraish would be buried in Makkah on whom whom would be half the chastisement of the world, and he did not want to be that person. He rejected the third proposal on the ground that he could not forsake the city of the Holv Prophet.
"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