Uthman laid down the criteria for justice in the following terms: "The dictates of justice demand that a proper equation should be maintained between the rights and obligations of the people. Whatever is their right should be conceded to them, and steps should be taken to ensure that whatever is their obligation is duly fulfilled?'.
"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