Ali issued the following instructions to Ziyad b Abiya, the Governor of Fars: "Beware that it is the matter of administration. Any lapse on your part is brought to my notice, I will deal with you harshly and will not spare you. Treat the path of moderation and do not waste public funds. Today remember your tomorrow. Spend only as much as is absolutely necessary. Whatever is surplus save it for a rainy day. Do not be arrogant. Do you think God would reward you for humility when you are arrogant? When you roll in luxury you will not be rewarded for poverty. A man is rewarded only for his accomplishment. One reaps what he sows."
"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