Ali's complaint against the Umayyads
During the caliphate of Othman, Ali had a complaint that the Umayyads were withholding from him what was due to him. He said, "The Umayyads are withholding what is due to me as the camel man, when milking the she camel, withholds the milk from the young one of the camel."
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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