Ali used to pray to God in the following terms: "O God, forgive my sins of which you know me more than me. And if I commit these sins again, even then because of Your munificence forgive me. If all the promises that I had made with myself to act according to Your command have not been fulfilled, kindly pardon my lapse. Moreover if I sought your proximity through my tongue, but my heart did not keep accord with my tongue even then forgive me, O God, forgive my acts of commission or omission, advertent or inadvertent. "
"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