Verse 18 of Sura 32 reads {32:18}: "Is he who is a believer like him who is an evil doer? Verily, they are not equal".
According to Ibn Abbas "believer" in this verse refers to Ali, and 'evil doer" refers to Walid b Utba.
"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