Tidings of paradise
The Holy Prophet gave the tidings of paradise to ten persons in their lifetime. Uthman was one of these ten persons called Ashra Mubashshara Over and above this, Uthman was given the tidings of paradise on three other occasions; when he purchased the "B'er Rauma" well and dedicated it to the use of the Muslims; when he financed the project for the extension of the Prophet's mosque at Madinah, and when he made a liberal contribution for the financing of the expedition to Tabuk.
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"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