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When, after the Battle of Siffin, Muawiyah began harassing the people by making raids into the territory adjoining Syria, the Governor of Ali, Kameel b Ziyad, suggested that he should be authorized to lead retributive expedition into Syria. Ali turned down the suggestion saying, "Two wrongs cannot make a right. Let Muawiyah take pleasure in harassing innocent people. I cannot resort to such measures."
"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