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Umar b Abdul Aziz, the Umayyad Caliph, was asked as to whom he considered to be the most pious man in the world. He said: "Ali excelled mankind in piety. Not only did he practice its virtues, but he also tried zealously to reform his friends, associates, acquaintances, and all those who came in contact with him."
"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