In 655 C.E. when Saeed b A1 'Aas was deposed from the governorship of Kufa, the people of Kufa demanded the appointment of Abu Musa Ash'ari as their Governor. Uthman accepted the demand and appointed Abu Musa Ashari as the Governor of Kufa. In his address on the occasion of the assumption of office Abu Musa secured an undertaking from the people of Kufa that they would not indulge in agitation, and would be loyal to Uthman. The people of Kufa, however, did not fulfil their undertaking and they sent a contingent to Madina to besiege the house of Uthman and press for his abdication. Although Abu Musa Ash'ari did nothing to oppose Uthman, he did nothing to help him either. He preferred to be neutral and watch developments.
"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