Uthman issued the following directive to the tax collectors:
"Know you all that all glory and "raise is for God. God enjoins justice, and He would not approve any act of administration which is not based on justice. Be just and fair to all concerned. Do not realize from any body what is not due from him. Be honest. See that the trust reposed in you is not betrayed. Do not oppress or harass the people. Pay particular regard to the orphans and the poor. See that they are not made to bear a burden which is beyond their capacity."
"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