Uthman as a Sufi
The Sufis regard Uthman as one of themselves. In his book Kashful Mahjub, Data Ganj Bakhsh refers to Uthman as one of the prominent Sufis. The attributes of Sufism which were very conspicuous in Uthman were his modesty, his piety, his humility, his charity and his resignation. :
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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