Uthman spent liberally in the way of God. He purchased the Bir Rauma well from a Jew and dedicated it to public use. He financed the project for the extension of the Prophet's mosque. He met a greater part of the expenses for the financing of the expedition to Tabuk. In the event of a famine the traders in Madina offered to purchase his stock of food grains after allowing him considerable profit. He distributed the entire stock among the people free, and declared that thereby he would earn a ten times profit from God. which no merchant could offer 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