Once Fatima gave some yarn that she had spun to Ali to sell it in the market and buy therewith some provisions for cooking meals. Ali sold the yarn for a gold coin. He came across some beggars, and he distributed the entire amount among the beggars. He had gone a few steps when he came across a man with a camel who said, "Ali, would you buy the camel." Ali said that he had no money. The man said that he could sell the camel on credit. Thereupon the man gave the bridle of the camel to Ali and disappeared. Ali had gone a few steps when another person met him and purchased the camel for a hundred gold coins. Ali thus got a hundred fold return for his charity.
"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