It appears that later some differences arose between Uthman and Talha. and Talha supported the rioters. It is reported that one day during the course of the siege, Uthman called out to the rioters and said, "Is Talha among you." Talha was present among the rioters but he did not respond to the call. When Uthman repeated the call for the third time, Talha responded to the call. Thereupon Othrnan said, "I did not expect that you would be among the rioters, and would not respond to my call." Uthman then asked Talha to recall that once when they were alone with the Holy Prophet, the Holy Prophet had said, "Uthman will be my companion in the paradise." Talha corroborated that what Uthman had said was correct. Thereupon he left the company of the rioters and went home.
"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