Verse 43 of Sura 13 reads {13:43}: "And those who disbelieve say 'You are not a Messenger'. Say to them Sufficient is Allah as a witness between me and you, and so is he who possesses knowledge of the Book".
According to commentators, the phrase "Whosoever has the knowledge of the Book", alludes to Ali.
"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